infix

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To fix in the mind; instill.
2. v. Linguistics To insert (a morphological element) into the body of a word.
3. n. Linguistics 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.

Century Dictionary and Cyclopedia

1. To fix or fasten in; insert forcibly; implant firmly: as. to infix a dart; to infix facts in the memory.
2. To insert additionally or accessorily. See infix, n.
3. n. Something infixed; in grammar, an element having the value of a suffix or a prefix, but inserted in the body of a word, as practised in some languages.

Wiktionary

1. v. transitive To instill.
2. v. transitive, linguistics To insert a morpheme inside an existing word.
3. n. linguistics A morpheme inserted inside an existing word, such as -i- and -o- in English. This adds additional meaning or alters the meaning of the morpheme it is inserted into.

GNU Webster's 1913

1. v. To set; to fasten or fix by piercing or thrusting in.
2. v. To implant or fix; to instill; to inculcate, as principles, thoughts, or instructions.
3. n. rare Something infixed.
4. n. (Grammar) An element that is inserted into the body of an elemt which it threby modifies, as a letter within a word.

WordNet 3.0

1. n. an affix that is inserted inside the word
2. v. put or introduce into something
3. v. attach a morpheme into a stem word