Separation of signals that should, under some circumstance, be distinguishable. Relative resolution (unitless) is the value of the distinguishable parameter (say, wavelength) divided by the smallest value difference that an experiment can actually distinguish. Absolute resolution (has units) is the smallest difference that can be discerned in a measured quantity.

The term "resolution" was found in the following pages:

Accurate determination of arsenic and its species by internal standardization | EVISA's News
Instrument database: PerkinElmer Inc. - Spectrum Spotlight 300 FTIR Imaging System
Instrument database: Netzsch-Gerätebau GmbH - STA 409 CD Simultaneous thermal analyzer
Instrument database: Bruker AXS GmbH - D2 CRYSO
Instrument database: Waters Corporation - nanoACQUITY UPLC System
Instrument database: Spectrolab Analytical - S50-IR
Determination of gadolinium-based MRI contrast agents in fresh and oceanic waters of Australia | EVISA's News
Instrument database: Shimadzu Europe - AXIMA-CFR plus MALDI TOF Mass Spectrometer
Instrument database: Mettler Toledo AG - MX5
IMSC 2018: 22nd International Mass Spectrometry Conference | EVISA's Agenda of Events
Instrument database: AMD Intectra GmbH - AMD QuAS3AR
Instrument database: GBC Scientific Equipment Ltd. - Quantima - Sequential Bench Top ICP-OES
Instrument database: Interspectrum - FTIR/FT-NIR bench top spectrometer Interspec 200-X
Instrument database: Carl Zeiss AG - SUPRA 40VP
New study reports evidence for carcinogenic chromium(VI) compounds in chromium(III)-treated living cells | EVISA's News
Instrument database: comstock Incorporated - mini TOF I
Instrument database: Aurora Instruments Ltd. - VIS 130 Spectrophotometer
Instrument database: SII Nano Technology Inc. - SPS 7800 Bench-top Optical Emission Spectrophotometer
Instrument database: Thermo Scientific - Orbitrap Exploris 120 Mass Spectrometer
Instrument database: Bruker AXS GmbH - Q4 MOBILE - mobile spark emission spectrometer