Definition of thorough

• prep. - Through.
• a. - Passing through; as, thorough lights in a house.
• a. - Passing through or to the end; hence, complete; perfect; as, a thorough reformation; thorough work; a thorough translator; a thorough poet.
• adv. - Thoroughly.
• adv. - Through.
• n. - A furrow between two ridges, to drain off the surface water.