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1. (mathematics) Less than.

   Synonym: ≱

   Antonyms: (equivalent opposite) >, (inverse) ≥, ≮

   ${\displaystyle \forall x<3}$ — for all x less than three

   ${\displaystyle x<3}$ — x is less than three

2. (linguistics) Which is from.

   Synonym: ←

   Antonym: >

3. (informal) A left-pointing arrow.

   Antonym: >

4. (Internet slang) Is worse (than); is inferior (to).

   Antonym: >

   cats < dogs (cats are worse than dogs)

   dogs < cats (dogs are worse than cats)

5. See < > for uses of these symbols enclosing other characters.

• ≤

• (mathematics) ≪, ⋘
• (arrow, in programming) <<, <<<

• Less than on Wikipedia.Wikipedia