I. adjective
Usage: usually capitalized
Etymology: from House of Lancaster, English royal family, after John of Gaunt, duke of Lancaster died 1399 + English -ian
: of or relating to the English royal house of Lancaster
II. noun
( -s )
Usage: usually capitalized
: a member or supporter of the English royal house of Lancaster that derived from the fourth son of the Plantagenet King Edward III and included Henry IV, Henry V, and Henry VI — compare yorkist
III. adjective
Usage: usually capitalized
Etymology: Lancaster county & Lancaster borough, England + English -ian
: of or relating to Lancashire or Lancaster
IV. noun
( -s )
Usage: capitalized
: a native or inhabitant of Lancashire or Lancaster