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

Roof work on the structure has been identified as a possible cause of the ignition, according to the Fire Department. —Clara Harter, Los Angeles Times, 8 Apr. 2026

Brian Hooker reportedly told officials that while the couple were on the smaller boat, known as a dinghy, Lynette fell into the water with the ignition key, causing the engine to shut off. —Adam Sabes, FOXNews.com, 8 Apr. 2026

Those in Tampa on the west coast of the peninsula and Jacksonville to the north won't see the rocket until 30-40 seconds after ignition. —Anthony Wood, Space.com, 1 Apr. 2026

Our state laws impose penalties such as fines, license revocation, mandatory ignition interlock devices and felony charges. —Sean M. Cleary, Sun Sentinel, 31 Mar. 2026

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