The definition of an isle is an island, particularly a small one.
(noun)An example of an isle is one of the tiny islands in the island nation of the Philippine Islands.
See isle in Webster's New World College Dictionary
noun
Origin: ME ile < OFr ile, earlier isle < ML isla, contr. < L insula < ? (terra) in salo, (land) in the sea < salum, sea: the form isle became general in the Renaissance, infl. by L insula
See isle in American Heritage Dictionary 4
noun Abbr. I.
Origin:
Origin: Middle English ile
Origin: , from Old French isle
Origin: , from Vulgar Latin *īsula
Origin: , from Latin īnsula
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