length

Length describes how long something is, or the amount of vertical space or time it takes up. (noun)

See length in Webster's New World College Dictionary

noun

the measure of how long a thing is; measurement of anything from end to end; the greatest of the two or three dimensions of anything
extent in space; distance anything extends
extent in time; duration
a long stretch or extent
the quality, state, or fact of being long
a piece of a certain or standardized length: a length of stove pipe
a unit of measure consisting of the length of an object or animal competing in a race: to win a boat race by two lengths
Phonet.
1. the duration of the pronunciation of a vowel: the i in bride has greater length than the i in bright
2. popularly the quality of a vowel
Prosody syllabic quantity

See length in American Heritage Dictionary 4

(lĕngkth, lĕngth, lĕnth)

noun

The state, quality, or fact of being long. See Usage Note at strength.
The measurement of the extent of something along its greatest dimension: the length of the boat.
A piece, often of a standard size, that is normally measured along its greatest dimension: a length of cloth.
A measure used as a unit to estimate distances: won the race by a length.
Extent or distance from beginning to end: the length of a novel; the length of a journey.
The amount of time between specified moments; the duration: the length of a meeting.
Extent or degree to which an action or policy is carried. Often used in the plural: went to great lengths to prove his point.
Linguistics
a. The duration of a vowel.
b. The duration of a syllable.
The vertical extent of a garment. Often used in combination: knee-length; floor-length.