Lancastrian (Adjective) — Of or relating to the former English royal house or their supporters. ex. "Lancastrian royalty"
Lancastrian (Adjective) — Of or relating to the English city of Lancaster or its residents. ex. "Lancastrian city centre"
Lancastrian (Adjective) — Of or relating to Lancashire or its residents.
Lancastrian (Noun) — A member (or supporter) of the house of Lancaster.
Lancastrian (Noun) — A resident of Lancaster.