late 14c., poetrie, "poetry, composition in verse; a poem; ancient literature; poetical works, fables, or tales," from Old French poetrie (13c.), and perhaps directly from Medieval Latin poetria (c. 650), from Latin poeta (see poet). In classical Latin, poetria meant "poetess."
Figurative use is from 1660s. Old English had metergeweorc "verse," metercræft "art of versification." Modern English lacks a true verb form in this group of words, though poeticize (1804), poetize (1580s, from French poétiser), and poetrize (c. 1600) have been tried. Poetry in motion (1826) perhaps is from poetry of motion (1813) "dance" (also poetry of the foot, 1660s). Poetry slam is by 1993.
... I decided not to tell lies in verse. Not to feign any emotion that I did not feel; not to pretend to believe in optimism or pessimism, or unreversible progress; not to say anything because it was popular, or generally accepted, or fashionable in intellectual circles, unless I myself believed it; and not to believe easily. [Robinson Jeffers (1887-1962), forward to "Selected Poems"]
Poetry — meaning the aggregate of instances from which the idea of poetry is deduced by every new poet — has been increasingly enlarged for many centuries. The instances are numerous, varied and contradictory as instances of love; but just as 'love' is a word of powerful enough magic to make the true lover forget all its baser and falser, usages, so is 'poetry' for the true poet. [Robert Graves, "The White Goddess"]
And the relation of the forms of poetry to the requirements of actual song is so fixed, that the laws of the four great groups of metre which we now successively to examine—the trimetre, tetrametre, pentametre, and hexametre—all depend upon the physical power of utterance in the breath. [Ruskin, "Elements of English Prosody, for use in St. George's Schools," 1880]