Etymology
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underage (adj.)

also under-age, 1590s, from under + age (n.).

updated on February 25, 2014

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Definitions of underage from WordNet

underage (adj.)
dependent by virtue of youth;
underage (adj.)
not of legal age;
Synonyms: minor / nonaged
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.