Etymology
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in-between (n.)

1815, "an interval;" also "a person who intervenes," noun use of prepositional phrase, from in (adv.) + between. Related: In-betweener (1912); in-betweenity (1927).

updated on October 10, 2017

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Definitions of in-between from WordNet

in-between (adj.)
being neither at the beginning nor at the end in a series;
adolescence is an awkward in-between age
Synonyms: mediate / middle
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.