Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: fifta, from fif 'five'

fifth

1 adjective
     
fifth1
1 coming after four other things in a series:
in the fifth century
her fifth birthday
2

fifth wheel

American English informal someone who is not wanted in a particular group of people:
They'd made her feel like a fifth wheel.
—fifth pronoun:
I'm planning to leave on the fifth (=the fifth day of the month).
—fifthly adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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