English
modular
From module + -ar.
A compound of module + -ar
Proto-Indo-European *med- ‘to measure’
…
Proto-Italic *modos
Latin modus ‘measure’
Latin modulus ‘a small measure, a measure, mode, meter’
French module
English module
Today it means
adj Consisting of separate modules; especially where each module performs or fulfills some specified function and could be replaced by a similar module for the same function, independently of the other modules.
Language periods are conventional ranges, not dates for this word.
Etymograph / modular