adjective
- introduced or coming from without; not belonging or proper to a thing; external; foreign: extraneous substances in our water.
- not pertinent; irrelevant: an extraneous remark; extraneous decoration.
adjective
- not essential
- not pertinent or applicable; irrelevant
- coming from without; of external origin
- not belonging; unrelated to that to which it is added or in which it is contained
adj.1630s, from Latin extraneus “external, strange,” from extra “outside of” (see extra-).