campaigner

plural campaigners

1. A person who has served in a military campaign.
2. broadlyA military veteran.
3. A person who campaigns for a person running for political office or works, or supports, in an organised and active way towards a goal; an activist.

   It is remembered unfondly by politicians, communities and campaigners as the document that heralded widespread reductions in the size of the railway.

   2023 March 8, Gareth Dennis, “The Reshaping of things to come...”, in RAIL, number 978, page 44

   2 more examples

   The US supreme court has ruled unanimously that natural human genes cannot be patented, a decision that scientists and civil rights campaigners said removed a major barrier to patient care and medical innovation.

   2013 June 21, Karen McVeigh, “US rules human genes can't be patented”, in The Guardian Weekly, volume 189, number 2, archived from the original on 28 Jun 2022, page 10

   The financial campaigner James Daley has launched a £1.5bn class action lawsuit against Apple over its mobile phone wallet, claiming the US tech company blocked competition and charged hidden fees that ultimately harmed 50 million UK consumers.

   2026 January 23, Kalyeena Makortoff, “Campaigner launches £1.5bn legal action in UK against Apple over wallet’s ‘hidden fees’”, in The Guardian, archived from the original on 24 Jan 2026

4. Someone with experience in a certain field.