Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
commander-in-chief is a noun meaning "the officer who holds the supreme command". It carries one recorded sense.
the officer who holds the supreme command
“in the U.S. the president is the commander in chief”
Definitions, synonyms and semantic relations for commander-in-chief come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.