measuring a great distance from end to end

a long corridor

long black hair

the queue for tickets was long

lasting or taking a great amount of time

a long and distinguished career

she took a long time to dress

relatively great in extent

write a long report

a long list of candidates

(of a vowel) categorized as long with regard to quality and length (e.g. in standard British English the vowel /uː/ in food is long as distinct from the short vowel /ʊ/ in good)

(of odds or a chance) reflecting or representing a low level of probability

winning against long odds

(of shares, bonds, or other assets) bought in advance, with the expectation of a rise in price

(of a drink) large and refreshing, and in which alcohol, if present, is not concentrated

well supplied with

an industry that's long on ideas but short on cash

a long period

see you before long

it will not be for long

a long sound such as a long signal in Morse code or a long vowel or syllable

two longs and a short

long-dated securities, especially gilts

for a long time

we hadn't known them long

an experience they will long remember

his long-awaited Grand Prix debut

(with reference to the ball in sport) at, to, or over a great distance

the Cambridge side played the ball long

have a strong wish or desire

she longed for a little more excitement

we are longing to see the new baby