Entry 1 sense Webster, 1913 Semiweekly · Sem·i·week·ly · IPA 01 a. Coming, or made, or done, once every half week; as, a semiweekly newspaper; a semiweekly trip. 1. Coming, or made, or done, once every half week; as, a semiweekly newspaper; a semiweekly trip.