noun
(uncountable) A silvery elemental metal with an atomic number of 28 and symbol Ni.
(US, Canada, countable) A coin worth 5 cents.
(US, slang, by extension) Five dollars.
(US, slang, by extension) Five hundred dollars.
(US, slang, sometimes the nickel or the hot nickel) Interstate 5, a highway that runs along the west coast of the United States.
(slang) A playing card with the rank of five
(US, slang) A five-year prison sentence.
(American football) A defensive formation with five defensive backs, one of whom is a nickelback, instead of the more-common four.
(UK, World War II) An airborne propaganda leaflet.
adjective
(US, idiomatic, somewhat dated) Synonym of cheap: Low price and/or low value.
verb
(transitive) To plate with nickel.
(UK, World War II) To distribute airborne leaflet propaganda.