prop. a. Of or pertaining to the monitorial system of instruction followed by Joseph Lancaster, of England, in which advanced pupils in a school teach pupils below them. [ 1913 Webster ]

prop. a. 1. Of or pertaining to Lancaster{ 2 }; as, Lancastrian royalty. [ WordNet 1.5 ]

2. Of or pertaining to the city of Lancaster{ 1 }; as, Lancastrian city center. [ WordNet 1.5 ]

3. Of or pertaining to the members of the house of Lancaster; as, Lancastrian members. [ WordNet 1.5 ]

4. Of or pertaining to the inhabitants of Lancaster; as, the Lancastrian population. [ WordNet 1.5 ]

prop. n. 1. A member (or supporter) of the house of Lancaster. [ WordNet 1.5 ]

2. A resident of Lancaster{ 1 }. [ WordNet 1.5 ]