Etymology
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L

twelfth letter, Roman form of Greek lambda, which is from the Semitic lamed. The shape of the Roman letter is an early one in Greek, adopted in Italic before it was superseded in Greek by the inverted form which became the Greek lambda. In some words (ladder, lady, laughter, leap, listen, lid) it represents Old English hl-. As "building or extension in the shape of an L" from 1843. As an "alphabetic abbreviation" [OED] of elevated railway, from 1881 (compare el). The Three Ls in nautical navigation were "lead" (for sounding), "latitude" and "lookout."

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Definitions of L
1
l (n.)
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 centimeters (or approximately 1.75 pints);
Synonyms: liter / litre / cubic decimeter / cubic decimetre
l (n.)
the cardinal number that is the product of ten and five;
Synonyms: fifty / "
l (n.)
a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter;
Synonyms: lambert
2
l (adj.)
being ten more than forty;
Synonyms: fifty / "
From wordnet.princeton.edu