Etymology
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pinpoint (n.)

also pin-point, 1849, "the point of a pin," from pin (n.) + point (n.). Taken into aeronautics in a sense of "place identified from the air" (used to ascertain the position of the aircraft); hence the verb meaning "locate precisely" (1917), which originally was aviators' slang. Related: Pinpointed; pinpointing. As an adjective, "performed with precisional accuracy," 1944, originally of aerial bombing.

updated on June 17, 2020

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Definitions of pinpoint from WordNet
1
pinpoint (n.)
a very brief moment;
they were strangers sharing a pinpoint of time together
pinpoint (n.)
a very small spot;
Synonyms: speck
pinpoint (n.)
the sharp point of a pin;
2
pinpoint (v.)
locate exactly;
can you pinpoint the position of the enemy?
Synonyms: nail
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.