transitionary Definition

transition
noun

1. A change or passage from one condition, state, subject, place, etc to another.

Thesaurus: change, conversion, metamorphosis, progression, shift, transformation, evolution, flux, development, passage; Antonym: beginning, end.
2. music.
A change from one key to another; a brief modulation.
3. archit.
The gradual change from one style to another, especially from Norman to Early English.
4. physics.
A change of an atomic nucleus or orbital electron from one quantum state to another where the emission or absorption of radiation is involved.

Derivative: transitional
adj

In, or relating to, a state of transition
Thesaurus: developmental, temporary, passing, intermediate, changing, provisional, unsettled; Antonym: final, initial.

Derivative: transitionally
adverb

Etymology: 16c: from Latin transitio a going across.