definition of
fin

[1] #1 fin n. [five, 5, V, cinque, quint, quintet, fivesome, quintuplet, pentad, Phoebe, Little Phoebe] the cardinal number that is the sum of four and one. wn

[2] #2 fin v. equip (a car) with fins. wn

[3] #3 fin n. [tail fin, tailfin] one of a pair of decorations projecting above the rear fenders of an automobile. wn

[4] #4 fin v. propel oneself through the water in a finning motion. wn

[5] #5 fin n. [louver, louvre] one of a set of parallel slats in a door or window to admit air and reject rain. wn