Why is poetry called a 'literature in metrical form' or 'a composition forming rhythmic lines'?
closed as too broad by sumelic, Peter Shor , Wayfaring Stranger, Mari-Lou A, Chenmunka Feb 25 at 14:33
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The definition you've cited is wrong. Britannica defines poetry as
"literature that evokes a concentrated imaginative awareness of experience or a specific emotional response through language chosen and arranged for its meaning, sound, and rhythm".
A work in metrical form may be poetry, but metre or rhythm is not necessary for a work to be regarded as poetry.