ignition

noun

ig·​ni·​tion ig-ˈni-shən 

1

a

: the device that is used to ignite the fuel mixture in a gasoline engine

put the key in the ignition

b

: the process or means (such as an electric spark) of igniting a fuel mixture

2

: the act or action of igniting: such as

a

: the starting of a fire

b

: the heating of a plasma to a temperature high enough to sustain nuclear fusion

Examples of ignition in a Sentence

There's a problem with the car's ignition.

Recent Examples on the Web

The source of the vapors and ignition is under investigation. —David Goodhue, Miami Herald, 6 June 2025

When dangerous weather patterns—like our infamous Santa Ana winds—spark wildfire risk, utility companies may implement a Public Safety Power Shutoff (PSPS) to reduce the potential of an ignition. —Advertorial, Oc Register, 5 June 2025

For example, using wildfire forecasting to plan or revise work in an area with a high probability of ignition could help prevent catastrophic physical and financial outcomes. —Renny Vandewege, Forbes.com, 30 May 2025

This week’s ignitions will be part of that process. —Tom Tapp, Deadline, 29 Apr. 2025

Word History

First Known Use

1612, in the meaning defined at sense 2

Rhymes for ignition

• addition
• admission
• ambition
• attrition
• audition
• clinician
• cognition
• coition
• commission
• condition
• contrition
• dentition

Kids Definition

ignition

noun

ig·​ni·​tion ig-ˈnish-ən 

1

: the act of igniting

2

: the process or means (as an electric spark) of igniting a fuel mixture

also : an electrical device for operating an ignition system (as in an automobile)

put the key in the ignition