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

And party insiders blame Trump’s tariffs and war with Iran for creating a volatile Senate map that has left seats in red states like Nebraska and Kansas vulnerable. — Burgess Everett, semafor.com, 2 Nov. 2026

There’s a bit of a conundrum with the Chiefs’ defense as pointed out by Pete Sweeney, The Star’s Chiefs insider, this week. — Scott Chasen, Kansas City Star, 1 Nov. 2026

Royal insider Rob Shuter recently claimed that William and Harry’s camps were working on a meeting. — Lizzie Lanuza, StyleCaster, 1 Nov. 2026

Footwear News will host a panel with industry insiders in order to explore how specialty run stores can attract more non-running running shoe wearers. — Ian Servantes, Footwear News, 29 Oct. 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