1. A person or group of people that invites discord on the internet by starting arguments or posting inflammatory, extraneous, or off-topic messages in an online community with the deliberate intent of provoking readers into an emotional response or otherwise disrupting normal on-topic discussion.
Source: U.S. Cyberspace Solarium Commission, March 2020, https://subscriber.politicopro.com/f/?id=00000170-c638-d8f7-a7f1-f63b33510000
2. A person who seeks to sow discord, disrupt, or influence behavior on the internet by posting inflammatory content
Source: An Investigation into Foreign Entities Who Are Targeting Servicemembers and Veterans Online, Vietnam Veterans of America, https://vva.org/wp-content/uploads/2019/09/VVA-Investigation.pdf