• 2MASS – Two Micron All Sky Survey
• AAS – American Astronomical Society
• ADAP – Astrophysics Data Analysis Program
• ADCAR – Astrophysics Data Curation and Archive Research 
• CDR – Critical Design Review
• CODEEN – Common Development Environment
• COORS – Common Coordination System
• CR – cosmic ray
• CVMFS – CERN Virtual Machine Filesystem
• DQ – data quality
• DCDA – Detector Characterization Data Archive
• DCL – Data Characterization Lab at GSFC
• DQLA – data quick look analysis
• DR – data release
• DSS – Data Storage Server
• E2E – End to End simulation working group
• EAR99 – Export Administration Regulations designation
• EAS – Euclid Archive System
• EC – Euclid Consortium
• ECB – Euclid Consortium Board
• ECL – Euclid Consortium Lead
• ENSCI – Euclid NASA Science Center at IPAC
• ESA – European Space Agency
• ESAC – European Space Astronomy Center
• EXT – external (not from Euclid itself) data used by SGS
• GSFC – NASA’s Goddard Space Flight Center
• HST – Hubble Space Telescope
• IAL – Interface Access Layer
• IDT – Instrument Definition Team
• IPC -- inter-pixel capacitance
• IRSA – NASA/IPAC Infrared Science Archive
• ISO – Infrared Space Observatory
• JPL – NASA’s Jet Propulsion Lab
• JWST – James Webb Space Telescope
• KDP – Key Decision Point
• LED – light emitting diode
• LODEEN – Local Development Environment
• LRR – Launch Readiness Review
• M-class – medium class ESA mission
• MOC – Mission Operation Center
• MOU – Memorandum of Understanding
• NIR – near-infrared
• NISP -- Near Infrared Spectrometer and Photometer
• NL -- non-linearity
• NOA – Notice of Award
• ORR – Operational Readiness Review
• OU – Organizational Unit (algorithm development group)
• OU-NIR – algorithm development for NIR imaging
• OU-PHOTZ – algorithm development for photometric redshifts
• OU-SIR – algorithm development for NIR grism
• PDR – Preliminary Design Review
• PO – Project Office
• PSF – point spread function
• QA – quality analysis / assurance
• OU – Organizational Unit
• QE – quantum efficiency
• RTN – random telegraph noise
• SC or Sch – Science Challenge
• SCE – Sensor Chip Electronics
• SDC – Science Data Center
• SDC-Dev – SDC work to develop software
• SDC-Prod – SDC work to run pipelines
• SED -- spectral energy distribution
• SGS – Science Ground Segment
• SMP – Science management Plan
• SPHEREx -- Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer
• SOC – Science Operation Center
• SPV – science performance verification
• SRR – System Readiness Review
• SSP – System Security Plan
• SWG – Science Working Group
• TBC – to be confirmed
• TBD – to be determined
• UI – user interface
• VIS – visible instrument
• VM – virtual machine
• WISE – Wide-field Infrared Survey Explorer
• WG – working group
• WP – work package