transitionary

noun

1. 1. a passing from one condition, form, stage, activity, place, etc. to another
   2. the period of such passing
2. a word, phrase, sentence, or group of sentences that relates a preceding topic to a succeeding one or that smoothly connects parts of a speech or piece of writing
3. Music
   1. a shifting from one key to another; modulation; esp., a brief or passing modulation
   2. an abrupt change into a remote key
   3. a passage connecting two sections of a composition

Origin: L transitio < transitus: see transit

intransitive verb