(algebra) An element of a structure that produces an identity mapping when applied on the left.

(Britain, Australia, New Zealand, derogatory) Left-wing politicians or activists whose policies or ideas are considered to be ridiculous or too politically correct.

(baseball) The part of a baseball field which is beyond the infield and to the left of a person standing on home plate and facing the pitcher.

Using one's left hand in preference to, or more skillfully than, one's right. / Intended to be worn on, or used by, the left hand. / Turning or spiraling from right to left; anticlockwise.

Left-handed people, taken as a whole.

(square dance) Move in which two facing dancers take left hands or forearms, turn halfway around to the left, let go, and step forward.

plural of left coset

(algebra) A left coset of a subgroup is a copy of that subgroup, multiplied on the left by some element from the parent group

(intransitive, computing) To press the left button on a computer mouse. / (transitive, computing) To activate an item on the screen by left-clicking while the pointer is over it.

(baseball) The outfield defensive player that stands to the left of the center fielder as viewed from home plate.