Ag
来自Big Physics
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Afrikaans, from Dutch ach (see ach).
wiktionary
Clipping of agriculture or agricultural.
Clipping of aggregate.
Borrowed from Afrikaans ag, from Dutch ach.
etymonline
ag (n.)
abbreviation of agriculture, attested from 1839s (in Secretary of Ag., etc.); by 1880s in reference to college courses, American English.