Available Definitions:
1) prep. - Through.
2) a. - Passing through; as, thorough lights in a house.
3) a. - Passing through or to the end; hence, complete; perfect; as, a thorough reformation; thorough work; a thorough translator; a thorough poet.
4) adv. - Thoroughly.
5) adv. - Through.
6) n. - A furrow between two ridges, to drain off the surface water.