inform

¹ American  

[in-fawrm] / ɪnˈfɔrm /

verb (used with object)

1. to give or impart knowledge of a fact or circumstance to.

   He informed them of his arrival.

   Synonyms:

   tell, advise, notify, apprise

2. to supply (oneself) with knowledge of a matter or subject.

   She informed herself of all the pertinent facts.

   Synonyms:

   acquaint

3. to give evident substance, character, or distinction to; pervade or permeate with manifest effect.

   A love of nature informed his writing.

4. to animate or inspire.

5. Obsolete.

   1. to train or instruct.

   2. to make known; disclose.

   3. to give or impart form to.

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verb (used without object)

1. to give information; supply knowledge or enlightenment.

   a magazine that entertains more than it informs.

verb phrase

1. inform on to furnish incriminating evidence about (someone) to an authority, prosecuting officer, etc..

   He informed on his accomplices.

inform ² American  

[in-fawrm] / ɪnˈfɔrm /

adjective

Obsolete.

1. without form; formless.

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inform ¹ British  

/ ɪnˈfɔːm, ɪnˈfɔːmɪdlɪ /

verb

1. (tr; often foll by of or about) to give information to; tell

2. (tr; often foll by of or about) to make conversant (with)

3. (intr; often foll by against or on) to give information regarding criminals, as to the police, etc

4. to give form to

5. to impart some essential or formative characteristic to

6. (tr) to animate or inspire

7. obsolete (tr)

   1. to train or educate

   2. to report

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inform ² British  

/ ɪnˈfɔːm /

adjective

1. archaic without shape; unformed

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Other Word Forms

• half-informing
  adjective
• half-informingly
  adverb
• informable
  adjective
• informedly
  adverb
• informingly
  adverb
• uninforming
  adjective

Etymology

Origin of inform¹

First recorded in 1350–1400; Middle English enfo(u)rmen, informen, from Old French enfo(u)rmer, from Latin infōrmāre “to form, shape,” equivalent to in- in- ² + fōrmāre “to form ”

Origin of inform²

First recorded in 1545–55; from Latin informis “formless, deformed,” equivalent to in- in- ³ + -formis -form

Explanation

To inform is to tell someone news, pass on wisdom, leak gossip, or give instruction. You've been informed that you won the raffle at the county fair. What are you going to do with all that cheese? The Latin verb infōrmāre means "to form or shape." The idea of passing on knowledge came about in the 14th Century, with the meaning of "teaching or instructing" coming later. Thomas Jefferson, who believed democracy to be impossible without informed citizens, said, “Educate and inform the whole mass of the people... They are the only sure reliance for the preservation of our liberty.”

Example Sentences

Even when shoppers do frequent brick-and-mortar shops, their online equivalents still inform purchase decisions.

From Barron's • May 27, 2026

"Our data provide important information of which pathogens native snakes may likely have but also which they are likely naïve to. This can inform actions needed to prevent pathogen spillover from captive snakes," Mishin concluded.

From Science Daily • May 26, 2026

“We want to create data for ourselves to inform our efforts as a collective in Holllywood,” Weissman said.

From Los Angeles Times • May 22, 2026

The Sharmas, who first reported their daughter's death to the police, have questioned why Twisha's in-laws did not inform the police.

From BBC • May 21, 2026

This type of processing may have implications for teaching, and awareness of the brain’s reaction to music can help inform teaching strategies and techniques.

From "Music and the Child" by Natalie Sarrazin

Related Words

• advise
• apprise
• brief
• caution
• educate
• instruct
• notify
• tell
• update
• warn