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

Contessa’s Corner Sports leagues, state gambling regulators and tribal leaders have all raised concerns that prediction market trades on sports don’t have the same level of guardrails as sportsbooks to protect against cheating by athletes, referees, coaches and other insiders. —Alex Sherman,contessa Brewer, CNBC, 9 Jan. 2026

An interim could be appointed, with BBC insiders suggesting that Rhodri Talfan Davies, the nations and regions chief, is a likely caretaker. —Max Goldbart, Deadline, 9 Jan. 2026

New York City New York tops the list because shopping here runs on momentum and insider routes, and nowhere else in the US offers the same density of flagship polish, niche discovery, and time-sensitive access in a single day. —Paul Jebara, Condé Nast Traveler, 9 Jan. 2026

That would cost more than $10 billion a year and take more than a decade to pay off, according to a consensus from industry experts, insiders and Wright. —David Goldman, CNN Money, 9 Jan. 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