| Noun | 1. | fifth - a quantity of liquor equal to one fifth of a United States gallon | |
| 2. | fifth - position five in a countable series of things; "he was fifth out of several hundred runners"rank - relative status; "his salary was determined by his rank and seniority" | |
| 3. | fifth - a fifth part | |
| 4. | fifth - the musical interval between one note and another five notes away from it | |
| Adj. | 1. | fifth - coming next after the fourth and just before the sixth in positionordinal - being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh" | |