(organic chemistry) A colourless crystalline compound, 2-hydroxy-1,2,3-propanetricarboxylic acid, C₆H₈O₇, found in citrus fruit; it is used as a food additive and in the manufacture of citrates.

(biochemistry) The Krebs cycle.

(botany) A tropical Asian grass, Cymbopogon nardus, that has citrus-scented leaves. / An essential oil obtained from this plant, often used as an insect repellent.

A member of a genre of documentary films from the 1920s and 1930s featuring scenes of city life.

An area of a town where the homeless gather at night to shelter under makeshift constructions of discarded boxes and packing material.

A census-designated place in Los Angeles County, California, United States.

(UK, with the definite article) The City of London, the historic core of London where the Roman settlement of Londinium was established.

A city in Missouri, United States and one of the two county seats of Jackson County. / A city, the county seat of Wyandotte County, Kansas.

The largest city in the United States, situated in the state of New York at the mouth of the Hudson River on the northeastern Atlantic Coast. It consists of five boroughs: Manhattan, the Bronx, Brooklyn, Queens, and Staten Island.

(intransitive, informal) To become more like or more in the character of a city. / (transitive, slang) To make more like or more in the character of a city.