"Summary execution" refers to a type of punishment where someone is killed without a fair trial or legal process. It means that a person is executed immediately or promptly, often without proper investigation or evidence presented. Full definition
Human Rights Watch reports claim that while West African forces helped restore security in these crises, which took place over a decade ago, they were also complicit in serious violations of international humanitarian law, including looting, harassment, and arbitrary detention of civilians, as well as — in the case of Sierra Leone — summary executions of suspected rebels. (blog.politics.ox.ac.uk)
Video footage emerging from Syria has showed rebels carrying out summary executions on prominent pro-Assad militia leaders, prompting condemnation from human rights groups. (politics.co.uk)
The First Order used internally conscripted Stormtroopers for at best summary executions and at worse extrajudicial killing for capital punishment. (myintimcity.com)