(1):

(n.) A fairy; an elf.

(2):

(n.) Faith; as, by my fay.

(3):

(v. t.) To fit; to join; to unite closely, as two pieces of wood, so as to make the surface fit together.

(4):

(v. i.) To lie close together; to fit; to fadge; - often with in, into, with, or together.