Usage patterns
仮の〈物〉a temporary/provisional ~
This house is just a temporary residence.
仮に〈事〉とするとsupposing that ~ / hypothetically, if ~
Hypothetically, if he doesn't come, what happens to the plan?
仮の名前an assumed name; an alias
He uses an assumed name online.
Expressions
仮の世this transient world; this fleeting life 仮の憂き世this transient world; this fleeting world かりそめにするmake light of; treat lightly; slight; neglect