L (Adjective) — Being ten more than forty.
L (Noun) — The 12th letter of the Roman alphabet.
L (Noun) — The cardinal number that is the product of ten and five.
L (Noun) — A cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimetre.
L (Noun) — A metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimetres (or approximately 1.75 pints).