1815, "an interval;" also "a person who intervenes," noun use of prepositional phrase, from in (adv.) + between. Related: In-betweener (1912); in-betweenity (1927).
adolescence is an awkward in-between age
inaugural
inaugurate
inauguration
inauspicious
inauthentic
in-between
inboard
inborn
inbound
inbox
inbred
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