[in.fix] vt [L infixus, pp. of infigere, fr. in- + figere to fasten--more at fix] (1502) 1: to fasten or fix by piercing or thrusting in
2: to impress firmly in the consciousness or disposition
3: to insert (as a sound or letter) as an infix syn see implant -- in.fix.ation n
[2]in.fix n (1881): a derivational or inflectional affix appearing in the body of a word (as Sanskrit -n- in vindami "I know" as contrasted with vid "to know") [3]in.fix adj (1971): characterized by placement of a binary operator between the operands "a + b is expressed in ~ notation"--compare postfix, prefix