say it: NAHYT-lahyf
nightlife is a noun meaning "the entertainment available to people seeking nighttime diversion". It carries 2 recorded senses.
the entertainment available to people seeking nighttime diversion
“a futile search for intelligent nightlife”
the activity of people seeking nighttime diversion (as at the theater, a nightclub, etc.)
“in the summer the nightlife shifts to the dance clubs”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for nightlife come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.