observer

noun

ob·​serv·​er əb-ˈzər-vər 

: one that observes: such as

a

: a representative sent to observe but not participate officially in an activity (such as a meeting or war)

b

: an expert analyst and commentator in a particular field

political observers

Synonyms of observer

• spectator
• viewer

Examples of observer in a Sentence

According to one observer, the event was poorly organized.

The star is not visible to an observer without a telescope.

According to one military observer, this change comes after years of planning.

Observers say the economy is improving.

The class has an observer today, so please be on your best behavior.

Recent Examples on the Web

With respect to Norvell and his players, observers are in show-me mode. — Gabriel Burns, AJC.com, 15 July 2026

Political observers believe his visit could extend beyond complying with the judicial summons. — Jacqueline Charles, Miami Herald, 15 July 2026

The gender gap surprised many observers, and researchers pointed to a diagnostic blind spot as one likely explanation. — Samantha Agate, Kansas City Star, 14 July 2026

This line defines Aldo as someone who sees himself as an active observer of both his own life and the world around him. — Marta Balaga, Variety, 14 July 2026

Word History

Etymology

observe + -er entry 2

First Known Use

circa 1550, in the meaning defined above

Phrases Containing observer

• casual observer
• inter-observer

Rhymes for observer

• preserver
• fervor
• fervour
• server