LONG definition: 1. continuing for a large amount of time: 2. being a distance between two points that is more than
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Wide may be used instead of long when referring to a left-to-right horizontal dimension, or to a horizontal dimension shorter than that described as long (for example, a river that is wide and long).

Long is used in expressions such as all year long, the whole day long, and your whole life long to say and emphasize that something happens for the whole of a particular period of time.

having considerable duration in time: a long conversation; a long while. extending, lasting, or totaling a number of specified units: eight miles long; eight hours long.

1. A long time: This won't take long. 2. Linguistics A long syllable, vowel, or consonant. 3. One who acquires holdings in a security or commodity in expectation of a rise in price.

Long division and long multiplication are typically used to simplify calculations when at least one of the numbers being divided or multiplied has more than one digit.

long, adj.Âč & n.Âč meanings, etymology and more | Oxford English Dictionary

The adjective long describes something that stretches over a large distance. If you're trying to avoid a prolonged visit with your crazy Aunt Martha, you might decide to take the long way to her house.