Why is poetry called a 'literature in metrical form' or 'a composition forming rhythmic lines'?

I found this image on Google while searching the definition of poetry

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  • Is this a question about etymology? Otherwise I'm not sure what answer you're looking for. – Laurel Feb 24 at 21:10
  • Because poetry is something which has a particular metre and rhythm. – Andrew Leach Feb 24 at 21:12
  • As Bob Dylan rather profoundly illustrated, poetry is what you can get away with calling poetry. – Wayfaring Stranger Feb 24 at 21:13
  • Do I need ask this question in Literature section? – yubraj Feb 24 at 21:16
  • If so, I will delete it – yubraj Feb 24 at 21:17

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.

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