1. to fix, fasten, or drive in: He infixed the fatal spear.
2. to implant: to infix a habit.
3. to instill (a fact, idea, etc.) in the mind or memory; impress.
4. Gram.to add as an infix.
Gram.(of a linguistic form) to admit an infix.
Gram.an affix that is inserted within the body of the element to which it is added, as Latin m in accumbō “I lie down,” as compared with accubuī “I lay down.”
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.