Definitionen
1.AdjectiveThe ordinal form of the number four.
2.NounThe person or thing in the fourth position.
3.NounA quarter, one of four equal parts of a whole.
4.NounThe fourth gear of an engine.
5.NounA musical interval which spans four degrees of the diatonic scale, for example C to F (C D E F).
6.NounOne sixtieth of a third or tierce.
7.VerbTo agree with a proposition or statement after it has already been thirded.