on a mission

idiom

Definition of on a mission

: undertaking a task that one considers to be a very important duty She's on a mission to locate her lost sister.

Learn More about on a mission

Statistics for on a mission

Cite this Entry

“On a mission.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20a%20mission. Accessed 31 Oct. 2020.

Comments on on a mission

What made you want to look up on a mission? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Here Be Dragons: A Creature Identification Quiz

  • monster werewolf photo
  • Which is a synonym of werewolf?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!