Real Dictionary

boss
Your boss is the person in charge of the organization or department where you work.
countable noun: If you are the boss in a group or relationship, you are the person who makes all the decisions.

boss in American English 1
a person in authority over employees, as an employer, a manager, or a foreman
adjective: chief; master
intransitive verb: to be boss
noun: a person who employs or superintends workers; manager
transitive verb: to be master of or over; manage; direct; control

boss in American English 2
a raised part or protruding ornament on a flat surface; a decorative knob, stud, etc.
to decorate with raised ornaments, metal studs, etc.
noun: a protuberance or roundish excrescence on the body or on some organ of an animal or plant
transitive verb: to ornament with bosses

boss in American English 3
cow1
noun: a familiar name for a calf or cow

boss in American English 4
adjective: hollow; empty

BOSS in British English
noun acronym for: Bureau of State Security; a branch of the South African security police

boss in British English 1
adjective: excellent; fine
noun: a person in charge of or employing others
verb: to employ, supervise, or be in charge of

boss in British English 2
to ornament with bosses; emboss
noun: a knob, stud, or other circular rounded protuberance, esp an ornamental one on a vault, a ceiling, or a shield

boss in British English 3
noun: a calf or cow

boss in Mechanical Engineering
noun: A boss is a cylindrical or rounded knob that projects from the surface of a part and provides a place for another object to attach onto it.