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.
Grammar. to add as an infix.
–verb (used without object)
5.
Grammar. (of a linguistic form) to admit an infix.
–noun
6.
Grammar. 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.”
Origin: 1495–1505; < L infīxus ptp. of infīgere to fasten in. See in-2, fix
Linguistics To insert (a morphological element) into the body of a word.
n.
Linguistics (ĭn'fĭks') An inflectional or derivational element appearing in the body of a word. For example, in Tagalog, the active verb sulat "write" can be converted to a passive, "written," by inserting the infix -in-, yielding sinulat.
[Back-formation from Middle English infixed, stuck in, from Latin īnfīxus, past participle of īnfīgere, to fasten in : in-, in; see in-2 + fīgere, to fasten; see dhīgw- in Indo-European roots.]
[v. in-fiks, in-fiks; n. in-fiks] 
