English Reference
verb

ignite

v.
US /ˌɪɡˈnaɪt/ UK /ɪɡnˈaɪt/ ig·nite UK spelling ignited, ignites, igniting

  1. 01 B2 Upper Intermediate

    to make something start burning.

    to set fire to something or to cause a substance to begin the process of combustion. Transitive in this use.

    Simple

    The spark from the campfire was enough to ignite the dry grass.

    In context

    The fuel-air mixture must be compressed significantly before the spark plug can effectively ignite it within the cylinder.

    lightkindleset fire to
  2. 02 B2 Upper Intermediate

    to catch fire and begin to burn.

    to catch fire or begin to undergo combustion. Intransitive in this use.

    Simple

    Gasoline can ignite easily if it is near a hot engine.

    In context

    Materials stored in the warehouse were so unstable that they could ignite spontaneously if the temperature rose above thirty degrees.

    catch fireburst into flames
  3. 03 C2 Proficiency Technical Science

    to heat a substance to a very high temperature without burning it.

    to subject a substance to intense heat, typically in a laboratory setting to remove volatile parts. Used for non-flammable materials.

    Simple

    The chemist had to ignite the sample in a crucible to find its dry weight.

    In context

    After the precipitate was filtered, it was necessary to ignite the residue at 800 degrees Celsius to ensure all organic matter was removed.

    calcineincinerate

However, data show that roads actually tend to increase the risk of fires igniting.

The Conversation· 26 Aug 2026

The play’s star hopes international interest in Japanese theatre will also ignite a new energy back home.

The Guardian· 14 Aug 2026

From Latin ignītus, past participle of igniō, ignire (“to set on fire, ignite”), from Latin ignis (“fire”), from Proto-Indo-European *h₁n̥gʷnis, and thus related to Sanskrit अग्नि (agní), Lithuanian ugnis, and Russian ого́нь (ogónʹ).

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

This entry
Origin ine-pro *h₁n̥gʷnis
Level B2 · Upper Intermediate
Frequency Frequent
Updated