An alternative or extrinsic reason for doing something, especially when concealed or when differing from the stated or apparent reason.

plural of ulterior motive

The incentive to undertake an activity based on the expected enjoyment of the activity itself, rather than external benefits that might result.

plural of intrinsic motivation

(music) leitmotif

plural of leading motive

plural of motive power

(philosophy) A form of an ad hominem attack consisting of questioning someone's motives to dismiss their claim.

(economics) The pursuit of financial gain as a motivation for individuals and firms to conduct business.

plural of motive power depot