English Reference
noun

intrusion

n.
US /ˌɪnˈtɹuʒən/ UK /ɪntɹˈuːʒən/ in·tru·sion UK spelling intrusion's, intrusion's

  1. 01 B2 Upper Intermediate

    the act of going into a place or situation where you are not invited or welcome.

    the act of entering a physical or metaphorical space without invitation or permission, often causing a disturbance.

    Simple

    I felt that his constant questions were an intrusion into my private life.

    In context

    The sudden intrusion of the press into the family's private mourning sparked a national debate about media ethics and privacy laws.

    Usage

    Often used with the preposition 'into'.

  2. 02 C1 Advanced Technical Psychology

    a memory or thought that pops into your head even though you do not want it there.

    an involuntary and distressing thought, image, or memory that enters the consciousness and causes anxiety.

    Simple

    She suffered from mental intrusions of the accident for several weeks.

    In context

    Clinical psychologists work with patients to manage cognitive intrusions that disrupt daily functioning and reinforce negative emotional states.

    Usage

    Commonly used in the context of trauma or anxiety disorders.

  3. 03 C2 Proficiency Technical Science

    liquid rock (magma) that is forced into existing cracks in other rocks.

    the process or result of magma being forced into preexisting rock formations and solidifying.

    Simple

    The cliff face showed a dark intrusion of volcanic rock through the limestone.

    In context

    Geologists identified a massive granite intrusion that had altered the surrounding sedimentary layers through intense heat and pressure.

    Usage

    Usually refers to the rock body itself or the geological event.

  4. 04 C2 Proficiency Technical

    a sound that people add when speaking even though it is not in the spelling.

    the insertion of a phoneme into the pronunciation of a word or phrase that is not represented in its orthography.

    Simple

    In some accents, the intrusion of an 'r' sound happens between two vowels.

    In context

    The researcher noted the frequent intrusion of a glottal stop in the local dialect, which served to separate adjacent vowel sounds across word boundaries.

    Usage

    Often used to describe the 'intrusive r' in certain English accents.

    epenthesis
    elision

From Middle English intrusioun, from Old French intrusion, from Medieval Latin intrūsiō, from intrūdō, from Latin in- + trūdō.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin in-
Level B2 · Upper Intermediate
Frequency Frequent
Updated