determine - fix in scope; fix the boundaries of; the tree determines the border of the property

be - have the quality of being; (copula, used with an adjective or a predicate noun); "John is rich"; "This is not a good answer"

redefine - give a new or different definition to; "She redefined his duties"

be - have the quality of being; (copula, used with an adjective or a predicate noun); "John is rich"; "This is not a good answer"

confine, limit, circumscribe - restrict or confine, "I limit you to two visits to the pub a day"