AC

Alternating Current

ACS

Attitude Control System

A/D

Analog to Digital

ADC

Analog to Digital Converter

ADS

Airbus Deutschland (Friedrichshaven)

AEI

Albert Einstein Institute

AETD

Applied Engineering and Technology Directorate

AGIS

Atomic Gravitational-wave Interferometer Sensor

AGN

Active Galactic Nuclei

AI

Atom Interferometry

AIV

Assembly, Integration, and Verification

AIVT

Assembly, Integration, Verification, and Testing

AIT

Assembly, Integration, and Testing

ALMA

Atacama Large Millimeter/submillimeter Array

Am CVn

AM Canum Venaticorum star (cataclysmic variable)

AO

Announcement of Opportunity

AOCS

Attitude and Orbital Control System

API

Application Programming Interface

APD

(NASA's) Astrophysics Division

ASD

Amplitude Spectral Density

AST

Autonomous Star Tracker

ATLO

Assembly, Test, and Launch Operations

AU

Astronomical Unit

BAO

Baryonic Acoustic Oscillation

BBN

Big Bang Nucleosynthesis

BH

Black Hole

BHB

Black Hole Binary

CAC

Cost at Completion

CAS

Constellation Acquisition Sensor

CBE

Current Best Estimate

CBOD

Clamp Band Opening Device

CCD

Charge-coupled Device

CCU

Caging Control Unit

CDM

Cold Dark Matter

CE

Cosmic Explorer

CFRP

Carbon Fiber Reinforced Plastic

CG

Cold Gas

CL

Confidence Level

CLHT

Can LISA Hear This? (Detectability Calculator)

CM

Charging Mechanism

CMB

Cosmic Microwave Background

CMNT

Colloidal micro-Newton Thruster

CMS

Charge Management System

CMU

Charge Management Unit

CNES

Centre National d'Études Spatiales

CoM

Center of Mass

COMBO

Classifying Objects By Medium-band Observations

COMS

Communications System (telemetry)

CST

Community Science Team

CTE

Coefficient of Thermal Expansion

CW

Continuous Wave

CWD

Compact White Dwarf binaries

D/A

Digital-to-Analog

D/SRE

Director of Science & Robotic Exploration

DAC

Digital-to-Analog Converter

DC

Direct Current

DCBH

Direct Collapse Black Hole

DCC

Data Computing Centre

DCIU

Digital Control Interface Unit

DDE

Diagnostics Drive Electronics

DDS

Data and Diagnostic Subsystem

DFACS

Drag-Free Attitude Control System

DMU

Data Management Unit

DOF

Degree(s) of Freedom

DP

Diagnostic Package

DPC

Data Processing Centre

DPLL

Digital Phase-locked Loop

DRS

Disturbance Reduction System

DSC

Daughter Spacecraft

DSN

Deep Space Network

DSP

Data Signal Processing

DTM

Deterministic Transfer Maneuver

DWD

Double White Dwarf (binary)

DWS

Differential Wavefront Sensing

ECSS

European Cooperation for Space Standardization

EELV

Evolved Expendable Launch Vehicle

EGAPS

European Galactic Plane Surveys

EH

Electrode Housing

EIRP

Equivalent Isotropic Radiative Power

eLISA

Evolved Laser Interferometer Space Antenna

ELITE

European LISA Technology Experiment

ELV

Expendable Launch Vehicle

EM

Engineering Model

EM

Electromagnetic

EMC

Electromagnetic Compatibility

EMI

Electromagnetic Interference

EMRI

Extreme Mass-Ratio Inspiral

EOL

End of Life

EOM

Electro-Optical Monitor

EPS

Electrical Power Subsystem

ESA

European Space Agency

ESAC

European Space Agency Center (Madrid, Spain)

ESTEC

European Space Research and Technology Centre

ET

Einstein Telescope

FAQ

Frequently Asked Question(s)

FDIR

Failure Detection, Isolation, and Recovery

FE

Finite Element

FEE

Front End Electronics

FEE SAU

Front End Electronics Sensing and Actuation Unit

FEEP

Field Emission Electric Propulsion

FFOGSE

Far Field Optical Ground Support Equipment

FM

Flight Model

FOH

Fiber Optical Harness

FOV

Field of View

FPAG

Fundamental Physics Advisory Group

FPGA

Field-programmable gate array

FR

(Laser) Frequency Reference

FSUA

Fiber Switch Unit Actuator

GB

Galactic Binary

GOAT

Gravitational Observatory Advisory Team

GPRM

Grabbing Position Release Mechanism

GR

General Theory of Relativity

GRACE

Gravity Recovery and Climate Experiment

GRACE-FO

GRACE Follow-On

GRB

Gamma-Ray Burst

GRS

Gravitational Reference Sensor

GS

Ground Station

GSE

Ground Support Equipment

GSFC

Goddard Space Flight Center

GTO

Geostationary Transfer Orbit

GW

Gravitational Wave

GW-WG

Gravitational-wave Observatory Working Group

H/W

Hardware

HDF

Hierarchical Data Format

HDRM

Hold Down and Release Mechanism

HEMP

High-Efficiency Micropropulsion

HEO

High Earth Orbit

HETO

Heliocentric Earth-Trailing Orbit

HGA

High Gain Antenna

HST

Hubble Space Telescope

I&T

Integration and Test(ing)

ICSO

Innermost Stable Circular Orbit

IFO

Interferometer

IFP

In-Field Pointing

IMBH

Intermediate-mass black hole

IMBBH

Intermediate Mass Binary Black Hole

IMBHB

Intermediate Mass Black Hole Binary

IMRI

Intermediate Mass-Ratio Inspiral

IMS

Interferometric Measurement System

InSpRL

Interferometer in Space for Detecting Gravity-wave Radiation using Lasers

IOCR

In-Orbit Commissioning Review

IOT

Instrument Operations Team

IPC

Industrial Policy Committee

IPT

Integrated Product Team

iPTF

intermediate Palomar Transient Factory

ISC

Inter-spacecraft Laser Communication

ISM

Instrument Sensitivity Model

ISM

Interstellar Medium

ITAR

International Traffic in Arms Regulations

ITAT

Integrated Technical Advisory Team(s)

ITT

Invitation To Tender

JILA

Joint Institute for Laboratory Astrophysics

JPL

Jet Propulsion Laboratory

JWST

James Webb Space Telescope

KAGRA

Kamioka Gravitational-wave Detector

KSC

Kennedy Space Center

L3ST

L3 Study Team

LAGOS

Laser Antenna for Gravitational-radiation Observation in Space

LCA

LISA Core Assembly

LCC

Life Cycle Cost

LCL

LISA Consortium Lead

LCM

LISA Core Module

LDB

LISA Mission Database

LDC

LISA Data Challenge

LDPG

LISA Data Processing Group

LED

Light-Emitting Diode

LEOP

Launch and Early Operations

LGA

Low Gain Antenna

LIGO

Laser Interferometer Gravitational-wave Observatory

LIMAS

LISA Instrument and Metrology Avionics System

LISA

Laser Interferometer Space Antenna

LIST

Laser International Science Team

LLD

Launch Lock Device

LMC

Large Magellanic Cloud

LMF

LISA Mission Formulation

LMT

Large Momentum Transfer

LoA

Letter of Agreement

LOCS

LISA Opto-mechanical Core System

LOLIPP

Level 0 to Level 1 Pipeline Procedure

LOS

Line of Sight

LOS

Loss of Signal

LPF

LISA Pathfinder

LRI

Laser-Ranging Interferometer

LS

Laser Subsystem

LSG

LISA Science Group

LSO

Last Stable Orbit

LSST

Large Synoptic Survey Telescope

LTP

LISA (Pathfinder) Technology Package

LVA

Launch Vehicle Adaptor

MA

Mission Assurance

MAXI

Monitor of All-sky X-ray Image

MBH

Massive Black Hole

MBHB

Massive Black Hole Binary

MBW

Measurement Bandwidth

MCMC

Markov-Chain Monte Carlo (simulation)

MECC

Merger Event Coordination Committee

MEL

Master Equipment List

MEOP

Maximum Expected Operating Pressure

MLA

Multi-Lateral Agreement

MLB

Motorized Light Band

MLDC

Mock LISA Data Challenge

MLI

Multi-Layer Insulation

MMH

Monomethyl Hydrazine

MOC

Mission Operations Center

MOPA

Master Oscillator Power Amplifier

MON-3

Mixed Oxides of Nitrogen with SI3 nitric oxide

MOSA

Moving Optical Sub-Assembly

MOT

Magneto-Optical Trap

MOU

Memorandum of Understanding

MPR

Mission Performance Requirement

MR

Measurement Requirement

MR

Mission Requirement

MRD

Mission Requirements Document

MSC

Mother Spacecraft

MSEM

Mission Systems Engineering Managers

MSS

MOSA Support Structure

NANOGrav

North American Nanohertz Observatory for Gravitational Waves

NASA

National Aeronautics and Space Administration

NDA

Non-Disclosure Agreement

NGO

New Gravitational-wave Observatory

NICM

NASA Instrument Cost Model

NLS

NASA Launch Services

NLSO

NASA LISA Study Office

NLST

NASA LISA Study Team

NPRO

Non-Planar Ring Oscillator

NR

Numerical Relativity

NRC

National Research Council

NRE

Non-Recurring Engineering

NS

Neutron Star

NSPIRES

NASA Solicitation and Proposal Integrated Review and Evaluation System

NWNH

New Worlds New Horizons

OAS

Optical Assembly Subsystem

OATM

Optical Assembly Tracking Mechanism

OAM

Optical Assembly Mechanics

OB

Optical Bench

OBA

Optical Bench Assembly

OBC

On-Board Computer

OMS

Optical Metrology System

OR

Operational Requirement

ORO

Optical Read-Out

P/L

Payload

P/M

Propulsion Module

PAA

Point-Ahead Angle

PAAM

Point-Ahead Actuation Mechanism

PBH

Primordial Black Hole

PCC

Payload Control Computer

PCDU

Power Control and Distribution Unit

PCS

Payload Control Subsystem

PCOS

Physics of the Cosmos

PDF

Probability Density Function

PDH

Probability Data Handling

PDR

Project Design Review

PEM

Payload Engineering Model

PFM

Proto-Flight Model

PI

Principal Investigator

PL

Power-Law (model)

PLL

Phase-Locked Loop

PM

Project Management, Phase Meter, or Proof Mass

PMDSP

Phase Meter Digital Signal Processor

PMFDE

Phase Meter Frequency Distribution Electronics

PMFEE

Phase Meter Front-End Electronics

PMS

Phase Measurement Subsystem

PN

Post-Newtonian

PPU

Power Processing Unit

PRN

Pseudo-Random Noise

PSD

Power Spectral Density

PSF

Point Spread Function

PSR

Pulsar

PTA

Pulsar Timing Array

PTF

Palomar Transient Factory

QE

Quantum Efficiency

QM

Qualification Model

QNM

Quasi-Normal Mode

QPD

Quadrant Photodetector

QSO

Quasi-Stellar Object

RATS

Rapid Time Survey

RF

Radio Frequency

RFI

Request for Information

RFP

Request for Proposal

RIN

Relative Intensity Noise

RIT

Radio frequency Ion Thruster

RMS

Root Mean Square

RSS

Root Sum Square

RTB

Real-time Test Bed

RX

Received Laser (from far Spacecraft)

S/C, SC

Spacecraft

S/W

Software

SciRD

Science Requirements Document

SCO

Stellar-mass Compact Object

SCOE

Special Check Out Equipment

SE

System Engineer(ing)

SEO

System Engineering Office

SEP

Solar Energetic Paricle

SEPD

Single-Element Photodiode

SGO

Space-based Gravitational-wave Observatory

SGWB

Stochastic Gravitational-wave Background

SI

Science investigation

SIR

System Integration Review

SISO

Single Input / Single Output

SMBH

Supermassive Black Hole

SMC

Small Magellanic Cloud

SNR

Signal-to-Noise ratio

SO

Science objective

SOBH

Stellar origin black hole

SOC

Science Operations Centre

SODPC

Science Operations Data Processing Center

SPC

Science Programme Committee

SRR

System Requirements Review

SS

Sub-system

SSB

Solar System Barycenter

SSC

Senior Science Committee

SST

Science Study Team

STM

Structural Thermal Model

STOC

Science Technology Operations Centre

SWT

Science Working Team

TAA

Technical Assistance Agreement

TAS

Thales-Alenia Aerospace Systems

TBD

To Be Determined

TC/TM

Telecommand / Telemetry

TCM

Trajectory Correction Maneuver

TDA

Technology Development Activities

TDI

Time-Delay Interferometry

TDI X

LISA's 2-arm configuration

TECC

Transient Event Coordination Committee

TM

Test Mass

TN

Technical Note

TRIP

Technical Readiness and Implementation Plan

TRL

Technical Readiness Level

TRP

Temperature Reference Points

TS

Telescope

TT&C

Telemetry, Tracking, and Command

TWTA

Traveling Wave Tube Amplifier

TX

Transmitted Laser (main laser in OB)

UCB

Ultra-Compact Binaries

ULX

Ultra-Luminous X-ray source

ULU

Ultraviolet Light Unit

URL

Uniform Resource Locator

USO

Ultra Stable Oscillator

UV

Ultraviolet

V&V

Verification and Validation

WD

White Dwarf

WSB

Weak Stability Boundary

XGNSB

Extragalactic Neutron Star Binary

XML

Extensible Markup Language

ZTF

Zwicky Transient Facility