Dictionary.com
Thesaurus.com
Synonyms

insider

American  
[in-sahy-der] / ˌɪnˈsaɪ dər /

noun

  1. a person who is a member of a group, organization, society, etc.

  2. a person belonging to a limited circle of persons who understand the actual facts in a situation or share private knowledge.

    Insiders knew that the president would veto the bill.

  3. a person who has some special advantage or influence.

  4. a person in possession of corporate information not generally available to the public, as a director, an accountant, or other officer or employee of a corporation.


insider British  
/ ˌɪnˈsaɪdə /

noun

  1. a member of a specified group

  2. a person with access to exclusive information

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of insider

First recorded in 1820–30; inside + -er 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

On Saturday, allegations were raised by some on social-media platforms like X that insiders had apparently used prediction markets to profit from advanced knowledge of the strikes.

From MarketWatch

On Saturday, allegations were raised by some on social-media platforms like X that insiders had apparently used prediction markets to profit from advanced knowledge of the strikes.

From MarketWatch

Democratic Sen. Chris Murphy of Connecticut said he would introduce legislation to ban the practice, citing a post on X alleging that six insiders may have reaped $1.2 million in profit from suspicious trades.

From MarketWatch

If the trend continues, we are heading for a crisis: a generation of employees who never become seasoned insiders, incapable of either collaborating or leading.

From The Wall Street Journal

The prediction-market platform is taking action against potential insider trading and market manipulation.

From The Wall Street Journal