名詞 insert:

1. a folded section placed between the leaves of another publication
2. an artifact that is inserted or is to be inserted
   同義詞：inset
3. (broadcasting) a local announcement inserted into a network program
   同義詞：cut-in
4. (film) a still picture that is introduced and that interrupts the action of a film
   同義詞：cut-in

動詞 insert:

1. put or introduce into something
   同義詞：infix, enter, introduce
2. introduce
   同義詞：enclose, inclose, stick in, put in, introduce
3. fit snugly into
   同義詞：tuck
4. insert casually
   同義詞：slip in, stick in, sneak in

1. Insert the key in the lock.
   把鑰匙插入鎖中。
2. Insert a diskette into one of your computer's disk drive, as describe on page1.
   把一張軟盤插入計算機(jī)的磁盤驅(qū)動器中，如第1頁所述。
3. A triangular insert, as in the seam of a garment, for added strength or expansion.
   襯料一種三角形的插入物，在衣服的縫合處，為加固或加大衣服而用
4. She inserted the key into the lock.
   她把鑰匙插入鎖中。

in.sert

v.tr.（及物動詞）
in.sert.ed,in.sert.ing,in.serts
To put or set into, between, or among:
插入，嵌入：把…放或插到里面或之間：
例句：
inserted the key in the lock.See Synonyms at introduce
把鑰匙插到鎖里參見 introduce

To put or introduce into the body of something; interpolate:
刊載：把…放入或引入某物體中；插入：
例句：
insert an illustration into a text.
在文章中插入一幅插圖

To place into an orbit, a trajectory, or a stream.
把…放入軌道，彈道或水流
n.（名詞）

Something inserted or intended for insertion, as a picture or chart into written material.
插入物：已插入或準(zhǔn)備插入的東西，如文字材料中的圖畫或圖表

來源：
Latin onserere onsert-
拉丁語 onserere onsert-
in- [in] * see in- 2
in- [在里面] *參見 in-2
serere [to join] * see ser- 2
serere [加入] *參見 ser- 2

【引伸】
insert.er
n.（名詞）