insertion
n. C / U C1 Advanced Oxford US //ˌɪnˈsɝʃən// UK //ɪnsˈɜːʃən// in·ser·tion
n. the act of putting something inside something else. You might use this word when talking about putting a card into a machine or a needle into skin.
n. the act or process of putting one thing into another; also refers to the specific point where a muscle or structure attaches to a bone.
The machine requires the slow insertion of the card.
The nurse explained that the insertion of the needle would cause a brief stinging sensation.
In anatomical terms, the insertion of a muscle is the point where it attaches to the bone that moves when the muscle contracts, as opposed to its fixed origin.
From insert + -ion.
Usage
Countable when referring to a specific instance or a physical addition to a text; uncountable when referring to the general process.