The word pinpoint was trending recently on EtymOnline.com, so naturally, I had to click in and see what was so interesting. And what I learned was that the way we use it most often–“to locate precisely”–is actually an aeronautic term dating from 1917.

Before that, pinpoint was a noun only, dating from around 1849, and it meant (gasp) “the head of a pin.” I know, I know. You never would have expected that! 😉 But as the field of aeronautics developed, they borrowed the word to mean “place identified from the air,” presumably because they could put a pin in a map, and it was used to ascertain where the aircraft was positioned. Hence, that verb we know so well today, which was aviator slang back a century ago. Phrases like pinpoint accuracy are from WW2 and was still aviator slang, used for precision bombing.