定界

dìngjiè
  1. demarcation
  2. boundary
  3. delimited
  4. bound (math.)

CEDICT

math

Entry Composition

1 定 dìng
  1. to fix; to set; to make definite
  2. to subscribe to (a newspaper etc); to book (tickets etc); to order (goods etc)
  3. to congeal; to coagulate
  4. (literary) definitely
2 界 jiè
  1. (bound form) boundary; border
  2. (bound form) realm