Definition of "Boss" :

noun: a circular rounded projection or protuberance

noun: a person responsible for hiring workers

"The boss hired three more men for the new job."

noun: a person who exercises control and makes decisions

"He is his own boss now."

noun: a person who exercises control over workers

noun: a leader in a political party who controls votes and dictates appointments

"Party bosses have a reputation for corruption."

verb: raise in a relief

"Embossed stationery."

adjective: exceptionally good

"A boss hand at carpentry."