Etymology
Advertisement

observer (n.)

1550s, "one who keeps a rule, custom, etc.," agent noun from observe. Meaning "one who watches and takes notice" is from 1580s; this is the sense of the word in many newspaper names. Meaning "one who observes without participating" (at a meeting, conference, etc.) is by 1925.

updated on July 26, 2019

Advertisement
Advertisement
Definitions of observer from WordNet

observer (n.)
a person who becomes aware (of things or events) through the senses;
Synonyms: perceiver / percipient / beholder
observer (n.)
an expert who observes and comments on something;
Synonyms: commentator
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.