lasting, existing, serving, or effective for a time only; not permanent

a temporary need; a temporary job.

an office worker hired, usually through an agency on a per diem basis, for a short period of time.

adjective

acting , ad hoc , ad interim , alternate , band-aid , brief , changeable , ephemeral , evanescent , fleeting , for the time being , fugacious , fugitive , impermanent , interim , limited , make-do , makeshift * , momentary , mortal , overnight , passing , perishable , pro tem , pro tempore , provisional , provisory , shifting , short , short-lived , slapdash * , stopgap * , substitute , summary , supply , temp , transient , transitory , unfixed , unstable , volatile , fleet , temporal , short-range , short-term , conditional , deciduous , ephemerous , episodic , expedient , extemporaneous , improvised , makeshift , mundane , stopgap , tentative , topical , transitional