insertion

noun

in·​ser·​tion in-ˈsər-shən 

1

: something that is inserted: such as

a

: the part of a muscle that inserts

b

: the mode or place of attachment of an organ or part

c

: embroidery or needlework inserted as ornament between two pieces of fabric

d

: a section of genetic material that is inserted into an existing gene sequence

2

a

: the act or process of inserting

b

: the mutational process producing a genetic insertion

insertional

in-ˈsər-sh(ə-)nəl 

adjective

Examples of insertion in a Sentence

Treatment may include the insertion of a tube in his ear.

The report contains a number of insertions.

Recent Examples on the Web

Early trials in Australia and Canada showed a perfect success rate for insertion of the gel’s delivery device, according to the company. —Ana Castelain, Bloomberg, 28 Jan. 2026

Instead of setting Orion up for an insertion into lunar orbit, the free-return trajectory will loop the spacecraft once around the moon on a figure-eight flight path back to Earth, ensuring the crew's return regardless of Orion's propulsion status, should unexpected issues crop up during flight. —Josh Dinner, Space.com, 27 Jan. 2026

One of those blew up on its landing attempt while another was purposefully expended to get its payload to a higher orbital insertion. —Richard Tribou, The Orlando Sentinel, 19 Jan. 2026

For easy production and instantaneous delivery, the applicator needle-patches are 3D-printable, and even when used across massive leaves, provide uniform insertion. —New Atlas, 4 Jan. 2026

Word History

First Known Use

1539, in the meaning defined at sense 1

Rhymes for insertion

• assertion
• cistercian
• coercion
• desertion
• exertion
• mercian
• overexertion
• reassertion

Kids Definition

insertion

noun

in·​ser·​tion in-ˈsər-shən 

1

: the act or process of inserting

2

a

: something inserted

b

: the part of a muscle that is attached to a part to be moved

3

: the mode or place of attachment of an organ or part

Medical Definition

insertion

noun

in·​ser·​tion in-ˈsər-shən 

1

: the part of a muscle by which it is attached to the part to be moved compare origin sense 2

2

: the mode or place of attachment of an organ or part

3

a

: a section of genetic material inserted into an existing gene sequence

b

: the mutational process producing a genetic insertion

insertional

-shnəl, -shən-ᵊl 

adjective