occurring or appearing every three weeks. occurring or appearing three times a week. noun, plural tri·week·lies. a triweekly publication.

What is once every 3 weeks called?

(Entry 1 of 2) 1 : occurring or appearing three times a week. 2 : occurring or appearing every three weeks. triweekly.

How do you say every 14 days?

Use the b in biweekly to remind you that the word means both 'twice a week' and 'every two weeks'. Use the for in fortnight to remind that the word means 'every fourteen days'. Remember that semi means half and think of the word as meaning 'every half a week'.