1630s, "to make larger, increase," from French agrandiss-, present participle stem of agrandir "to augment, enlarge" (16c.), ultimately from Latin ad "to" (see ad-) + grandire "to make great," from grandis "big, great; full, abundant" (see grand (adj.)). The double -g- spelling in English (also formerly in French) is by analogy with Latin words in ad-. Related: Aggrandized; aggrandizing.
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