n. 1. Commonly . (a) A quick offhand shot, made without deliberately taking aim over the sights. (b) (Photog.) Act of taking a snapshot (in sense 2). [ Webster 1913 Suppl. ]

2. An instantaneous photograph made, usually with a hand camera, without formal posing of, and often without the foreknowledge of, the subject. [ Webster 1913 Suppl. ]

3. a brief summary or appraisal, especially one that describes the state of a situation at one particular time; as, a snapshot of the moon project in 1966. [ PJC ]