The definition of less is not as much.(adjective)
An example of less used as an adjective is in the sentence, "She has less money than he does," which means that she does not have as much money as he does.
Less is defined as minus.(preposition)
An example of less used as a preposition is in the sentence, "Ten less seven is three," which means ten minus seven is three.
Less is defined as to a smaller degree or amount.(adverb)
An example of less used as an adverb is in the sentence, "The shrimp is less tasty than the crab," which means that the crab tastes better.
Less means a smaller amount or something not as important.(noun)
An example of less used as a noun is in the sentence, "She used less than he did," which means she used a smaller amount that he did.
See less in Webster's New World College Dictionary
Origin: ME les < OE læs, adv. læssa, adj. (used as compar. of lytel, little), akin to OFris les < IE *leis- < base *lei-, to diminish, meager, > little
Origin: ME -les, -leas < OE -leas < leas, free, loose, akin to losian, lose
See less in American Heritage Dictionary 4
adjective A comparative of little.
Origin: Middle English lesse
Origin: , from Old English lǣssa (adj.)
Origin: and lǣs (adv.); see leis-2 in Indo-European roots.
Origin: Middle English -lesse
Origin: , from Old English -lēas
Origin: , from lēas, without; see leu- in Indo-European roots.
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