"lesser" in the adjective sense

1. less

comparative of `little' usually used with mass nouns) a quantifier meaning not as great in amount or degree

"the lesser anteater"

"the lesser of two evils"

"of less importance"

"less time to spend with the family"

"a shower uses less water"

"less than three years old"

2. less

usually preceded by `no') lower in quality

"the lesser powers of Europe"

"the lesser anteater"

"no less than perfect"

3. less

nonstandard in some uses but often idiomatic with measure phrases) fewer

"less than three weeks"

"no less than 50 people attended"

"in 25 words or less"

Source: WordNet® (An amazing lexical database of English)

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