An insertion is when you put something into another thing, like the insertion of a key into a lock, or the insertion of a comment into a conversation.

You probably notice that the noun insertion contains the verb insert, meaning “put in.” An insertion is something that’s put into something else. It can be used literally to describe, for example, the insertion of a page in a binder, but it also can be used more figuratively. For example, the insertion of the president into office happens every four years. And your brother may constantly make insertions into discussions he knows nothing about.

Definitions of insertion
  1. noun
    the act of putting one thing into another
    synonyms: introduction, intromission
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    cannulation, cannulisation, cannulization, canulation, canulisation, canulization, intubation
    the insertion of a cannula or tube into a hollow body organ
    instillation, instillment, instilment
    the introduction of a liquid (by pouring or injection) drop by drop
    enclosing, enclosure, envelopment, inclosure
    the act of enclosing something inside something else
    the forceful insertion of a substance under pressure
    blood transfusion, transfusion
    the introduction of blood or blood plasma into a vein or artery
    pumping a liquid into an organ or tissue (especially by way of blood vessels)
    boxing, packing
    the enclosure of something in a package or box
    encasement, incasement
    the act of enclosing something in a case
    epidural injection
    injection of an anesthetic substance into the epidural space of the spinal cord in order to produce epidural anesthesia
    (medicine) the passive introduction of a substance (a fluid or drug or electrolyte) into a vein or between tissues (as by gravitational force)
    exchange transfusion
    slow removal of a person's blood and its replacement with equal amounts of a donor's blood
    type of:
    the act of changing the location of something
  2. noun
    a message (spoken or written) that is introduced or inserted
    “with many insertions in the margins”
    synonyms: interpolation
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    type of:
    content, message, subject matter, substance
    what a communication that is about something is about
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