insider

noun

in·​sid·​er (ˌ)in-ˈsī-dər 

ˈin-ˌsī-

: a person recognized or accepted as a member of a group, category, or organization: such as

a

: a person who is in a position of power or has access to confidential information

b

: a person (such as an officer or director) who is in a position to have special knowledge of the affairs of or to influence the decisions of a company

Examples of insider in a Sentence

Political insiders say that she is planning to run for president.

The book gives fans an insider's view of Hollywood.

Recent Examples on the Web

Dani is an insider’s favorite and a rising star among her peers, and she’s partnered with The Vault to exclusively offer access to perhaps her most jaw-dropping piece yet. —Mark Ellwood, Robb Report, 23 Dec. 2025

As for Baldoni, multiple industry insiders believe the legal fight may have lasting professional consequences. —Elizabeth Rosner, PEOPLE, 23 Dec. 2025

All three films exist within an insiders’ New York, inhabited by the hustler mentality of their main characters. —Kristen Tauer, Footwear News, 22 Dec. 2025

The rookie defenseman was a candidate to join the Canadian team at the IIHF World Junior Championship in Minnesota, but longtime NHL insider Frank Seravalli reported Sunday that Dickinson would remain with the Sharks during the World Juniors. —Christian Babcock, Mercury News, 22 Dec. 2025

Word History

First Known Use

1848, in the meaning defined above

Phrases Containing insider

• insider trading

Rhymes for insider

• collider
• confider
• divider
• outsider
• provider
• cider
• cyder
• eider
• glider
• hider
• rider
• schneider

Kids Definition

insider

noun

in·​sid·​er (ˈ)in-ˈsīd-ər 

: a person who is a member of a special group or organization

Legal Definition

insider

noun

in·​sid·​er

: a person who is in a position of power or has access to confidential information: as

a

: one (as an officer, director, employee, relative, or owner of more than 10% of the corporation's stock) who is in a position to have special knowledge of the affairs of or to influence the decisions of a company

b

: an individual (as a relative or an influential party) or entity (as a corporate affiliate) having a close relationship with a debtor such that transactions are not made at arm's length and are subject to closer scrutiny than the transactions of those dealing at arm's length