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

Despite their clerical nature, an initial hearing is critical to a person’s immigration case, said Erin Moncure, who has volunteered as a court observer with the nonprofit CLUE since September. — Itzel Luna, Los Angeles Times, 1 July 2026

Chances to see the northern lights are even higher in Alaska and significantly increase the farther inland observers are in the state. — Antonio Pequeño Iv, Forbes.com, 1 July 2026

Most independent observers have suggested that a 12- to 18-month timeline is probably the most realistic for New Glenn’s return to flight. — Eric Berger, ArsTechnica, 1 July 2026

As such, some observers speculated that Comcast and NBCU independently will indeed be chasing big deals on their own. — Todd Spangler, Variety, 30 June 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