Also found in: Dictionary, Thesaurus, Medical, Legal, Encyclopedia.
Omit, fail to include, as in This sentence doesn't make sense; a key word has been left out. [Late 1400s]
1. To allow something or someone to remain outdoors: I left the dog out last night.
2. To allow something to remain in plain sight: Who left the dirty dishes out on the kitchen counter?
3. To fail to include or mention something; omit something: We weren't sure if the facts were correct, so we left that section out of the report. You've left out the decimal point on this price tag.