primer

¹ American  

[prim-er, prahy-mer] / ˈprɪm ər, ˈpraɪ mər /

noun

1. an elementary book for teaching children to read.

2. any book of elementary principles.

   a primer of phonetics.

3. great primer.

4. long primer.

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primer ² American  

[prahy-mer] / ˈpraɪ mər /

noun

1. a person or thing that primes.

2. a cap, cylinder, etc., containing a compound that may be exploded by percussion or other means, used for firing a charge of powder.

3. a first coat or layer of paint, size, etc., given to any surface as a base, sealer, or the like.

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primer ¹ British  

/ ˈpraɪmə /

noun

1. a person or thing that primes

2. a device, such as a tube containing explosive, for detonating the main charge in a gun, mine, etc

3. a substance, such as paint, applied to a surface as a base, sealer, etc

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primer ² British  

/ ˈpraɪmə /

noun

1. an introductory text, such as a school textbook

2. printing See long primer great primer

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Etymology

Origin of primer¹

1350–1400; Middle English < Medieval Latin prīmārium, noun use of neuter of prīmārius primary

Origin of primer²

1490–1500; prime (v.) + -er ¹

Explanation

A primer gets you ready for what comes next. You could use one kind of primer when you are learning to read, or another kind when you are preparing to paint a room. Any way you use the word primer, it's a first step or preparation for something else. There's primer you use before painting, and an engine primer that prepares a machine to be started. In these examples, primer rhymes with timer. When primer describes an introductory textbook, it rhymes with dimmer. In the 14th century, a primer was a prayer book. This word comes from primus, the Latin word for first.

Example Sentences

See Examples For:

primer

Workers failed to apply enough primer in some areas, preventing layers of the liner from bonding properly.

From Salon ● Sep. 12, 2026

But the debate between the Iraqi leader and the CIA analyst—the former arrogant, canny and pragmatic; the latter cautious, politic but unyielding—makes for an exciting primer on the recent history of the region.

From The Wall Street Journal ● Sep. 10, 2026

Use high-protection sunscreen - at least SPF 30 - as a base before the make-up and let it soak in like any primer, says Wedgeworth.

From BBC ● Jul. 30, 2026

Some taggers also laid down primer before painting windows, Petty said.

From Los Angeles Times ● Jul. 23, 2026

The primer would be repeated again and again because the transmitting civilization would have no way to know when we tuned in on the message.

From "Cosmos" by Carl Sagan