mission /ˈmɪʃ.ən/noun 11verb 3forms 3phrases 1 noun11 •a task with a clear purpose that someone is given to do or chooses to do •(slang) A drug run. •A important goal or purpose; an objective.[She] made it her mission in life to make sure that no one around them would ever know the real truth. But this daughter of hers, she was a loose cannon, she was not someone to be trusted.[…] — 2008 •A number of people appointed to perform any service; a delegation; an embassy.[I]n either of these Ships, there should be a Mission of three of the Fellowes, or Brethren of Salomons House; [...] — 1627 •A settlement or building serving as a base for missionary work.Many cities across the Americas grew from Spanish missions. •(Australia) An settlement predominantly inhabited by Indigenous Australians living in housing commission. •(informal) An ordeal; an difficult, trying task.I was thinking like meat, [you could use this wooden device to] tenderize a steak ... but not into a wooden box, 'cause it's gonna be a mission to clean. — 2025 •A missionary expedition. •[in the plural] Third World charities, particularly those which preach as well as provide aid. •An infrequent gathering of religious believers in a parish, usually part of a larger regional event with a central theme. •(no longer used) Dismissal; discharge from service verb3 •to send someone to a place to do an important task •To undertake an arduous or long task that requires substantial effort. •to work to spread a religion by teaching people about it and trying to get them to join it formsmissioned · missioning · missions Phrases with mission mission creepGradual unplanned expansion of the objectives, scope, and/or cost of a project, especially a military mission.