Transitions: the process or an instance of

transition
journey
shift
movement
proceed
forward
sideways
inward
directionless?

Thesaurus: transition noun
The process or an instance of passing from one form, state, or stage to another: change, passage, shift, transit. See change/persist.

Antonyms: transition n
Definition: change, often major

Antonyms: beginning, conclusion, end, finish, introduction, sameness, stagnation, start