Definition of "Gay" :
noun: someone who practices homosexuality; having a sexual attraction to persons of the same sex
adjective: bright and pleasant; promoting a feeling of cheer
"A gay sunny room."
adjective: brightly colored and showy
"A dress a bit too gay for her years."
adjective: homosexual or arousing homosexual desires
adjective: given to social pleasures often including dissipation
"Led a gay Bohemian life."
adjective: offering fun and gaiety
"Gay and exciting night life."
adjective: full of or showing high-spirited merriment
"When hearts were young and gay."