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
adjective: exceptionally good
"A boss hand at carpentry."