Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
in-between is an adjective meaning "being neither at the beginning nor at the end in a series". It carries one recorded sense.
being neither at the beginning nor at the end in a series
“adolescence is an awkward in-between age”
“in a mediate position”
“the middle point on a line”
Definitions, synonyms and semantic relations for in-between come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.