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 high-heat coils of a toaster sit mere inches away from where crumbs collect, creating a potential ignition source if debris isn't regularly cleared out. —Caroline Lubinsky, Martha Stewart, 13 May 2026

According to the report, the car was found with the keys in the ignition and the engine off. —Sarah Dahlberg, NBC news, 10 May 2026

While the rotary knob that surrounds the ignition button provides quick access to the various drive modes (which includes a customizable Individual mode), hard buttons for features like damper stiffness and exhaust volume allow for specific alterations to the driving experience on the fly. —Bradley Iger, Robb Report, 8 May 2026

When airflow is blocked or debris meets a spark, ignition becomes much more likely. —Lauren Jarvis-Gibson, Sacbee.com, 8 May 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