(1):

(n.) A minute arachnid, of the order Acarina, of which there are many species; as, the cheese mite, sugar mite, harvest mite, etc. See Acarina.

(2):

(n.) A small weight; one twentieth of a grain.

(3):

(n.) A small coin formerly circulated in England, rated at about a third of a farthing. The name is also applied to a small coin used in Palestine in the time of Christ.

(4):

(n.) Anything very small; a minute object; a very little quantity or particle.