| Noun | 1. | field day - (military) a day for military exercises and displayday - a day assigned to a particular purpose or observance; "Mother's Day" | |
| 2. | field day - a day for outdoor athletic competitionday - a day assigned to a particular purpose or observance; "Mother's Day" | |
| 3. | field day - a time of unusual pleasure and successperiod, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period" | |
| 4. | field day - a day devoted to an outdoor social gatheringholiday, vacation - leisure time away from work devoted to rest or pleasure; "we get two weeks of vacation every summer"; "we took a short holiday in Puerto Rico" | |