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

For more insider tips on Southern California’s beaches, trails and parks, check out past editions of The Wild. —Jaclyn Cosgrove, Los Angeles Times, 4 June 2026

Dylan Larkin, captain of the Detroit Red Wings, has requested a trade from the team, ESPN NHL insider Emily Kaplan said on Thursday afternoon. —Nick Lentz, CBS News, 4 June 2026

According to industry insiders, those figures are self-reported by NBC. —Bobby Burack Outkick, FOXNews.com, 3 June 2026

According to police reports and court records, Kisakye, 27, of Randolph, used his insider knowledge of the couple’s home to break in, unlock their safe, then make off with large diamonds, gold, watches, and pearls. —Colleen Cronin, Boston Herald, 3 June 2026

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