More swift or fast-moving; quicker; more nimble.
Comparative form of 'fleet' (adjective, from Old English 'fleot' meaning swift), formed regularly with the '-er' suffix to create the comparative degree of this one-syllable adjective.
When Milton wrote of 'fleeter fame,' he was already using this comparative in an archaic way—by his time, 'fleet' was becoming mainly nautical, so 'fleeter' sounded poetic and elevated rather than everyday.
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