All 4 Uses

motive
in
Utopia, by Thomas More
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Their principal motive for this is the convenience of carriage, that their timber may be either near their towns or growing on the banks of the sea, or of some rivers, so as to be floated to them; for it is a harder work to carry wood at any distance over land than corn.†
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motive = reason (for doing something)
From whichsoever of these motives it might be, true it is, that many of them came over to our religion, and were initiated into it by baptism.†

motives = reasons for doing something
There are many among them that upon a motive of religion neglect learning, and apply themselves to no sort of study; nor do they allow themselves any leisure time, but are perpetually employed, believing that by the good things that a man does he secures to himself that happiness that comes after death.†

motive = reason (for doing something)
They would indeed laugh at any man who, from the principles of reason, would prefer an unmarried state to a married, or a life of labour to an easy life: but they reverence and admire such as do it from the motives of religion.†

motives = reasons for doing something

Definitions:

(1) (motive as in: What is her motive?)
a reason for doing something
(2) (meaning too rare to warrant focus)
Less commonly, motive can refer to something that causes motion in an inanimate object. Even less commonly, it can refer to a distinctive feature in music, art, or literature.