amerikai:
brit:
1. (not used in the plural) The person or thing in the fourth position.
2. (chiefly American) A quarter, one of four equal parts of a whole.
3. (not used in the plural) The fourth gear of an engine.
4. A musical interval which spans four degrees of the diatonic scale, for example C to F (C D E F).
1. The ordinal form of the number four.