# insertion

Pronunciation: say "in-SUR-shuhn" US /ɪnˈsɝʃən/, UK /ɪnˈsɜːʃən/

## Noun

1. The act of putting one thing inside another, or the thing that has been put in.
   - Simple: The act of putting something into something else, or the thing that is put in.
   - _The insertion of a comma changed the sentence's meaning entirely._
   - _The tailor sewed a delicate lace insertion into the dress's bodice._
2. The attachment point on the bone that a muscle moves, located at the muscle's far end away from the body's center.
   - Simple: The place where a muscle attaches to the bone it moves.
   - _The biceps has its insertion on the radius, the forearm bone it flexes._
   - _Surgeons repaired the tendon near its insertion on the heel._
3. A mutation that adds a nucleotide into a chromosome.
   - Simple: A change in DNA where an extra building block is added.
   - _The insertion shifted the reading frame and disrupted the protein._
   - _Researchers traced the disorder to an insertion in a single gene._
4. The transition of fissile material from subcritical to prompt critical, the point at which a runaway chain reaction can begin.
   - Simple: The change that takes nuclear material from inactive to ready to explode.
   - _The weapon's design depends on a rapid insertion to reach its full yield._
   - _Any delay in the insertion would let the assembly fizzle._

## Origin

Formed from the verb "insert" combined with the suffix "-ion".

Source: DictionaryAI, https://dictionaryai.com/define/insertion (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).