名詞 infix:

1. an affix that is inserted inside the word

動詞 infix:

1. put or introduce into something
   同義詞：insert, enter, introduce
2. attach a morpheme into a stem word

in.fix

v.tr.（及物動詞）
in.fixed,in.fix.ing,in.fix.es
To fix in the mind; instill.
注入；灌輸
Linguistics To insert (a morphological element) into the body of a word.
【語言學】 中綴：在一個字中間加入語素
n.（名詞）

An inflectional or derivational element appearing in the body of a word. In the Tagalog wordsinulat, .written,. the infix -in- appears as the marker of a passive form that contrasts with the active form sulat, .write..
中綴，中加成分：一個單詞中表示屈折變化或派生關系的成分。在他加祿語中，sinulat 一詞表示.書面的.，中綴成分 -in- 表示被動的形式，與主動形式的動詞 sulat .書寫.相對

來源：
Back-formation from Middle English infixed [stuck in]
源自 中古英語 infixed的逆構詞 [插入]
from Latin onfixus [past participle of] onfogere [to fasten in]
源自 拉丁語 onfixus [] onfogere的過去分詞 [系到某物]
in- [in] * see in- 2
in- [在里面] *參見 in-2
fogere [to fasten] * see dhog w-
fogere [系緊] *參見 dhog w-