at
UK[ət]US[ət]
prep
used to show an exact position or particular place
prep
used to show a point in time
prep
used to show the person or thing toward which an action is directed or toward which a feeling is pointed
Etymology
The word 'at' is a direct descendant of the Old English preposition 'æt', which held core meanings of location, proximity, and direction. It is a common Germanic word, with cognates in Old Norse ('at'), Gothic ('at'), and Old High German ('az'), all pointing to a shared Proto-Germanic origin in 'at'. This root likely further connects to the Proto-Indo-European (PIE) adverbial particle 'ad-', meaning 'to, near, at'. The semantic journey is remarkably stable; from its ancient function of indicating physical nearness or direction toward a point, 'at' has retained its core grammatical role in English as the primary preposition for specifying a precise location, time, or target.
Analysis
This is a simplex word, a grammatical particle inherited from Old English. It is a preposition and adverb particle.
Examples
We agreed to meet at the library.
The movie starts at seven o'clock.
She smiled at the child.