[tri.week.ly] adj (1832) 1: occurring or appearing three times a week
2: occurring or appearing every three weeks -- triweekly adv
[2]triweekly n, pl -lies (1851): a triweekly publication
[tri.week.ly] adj (1832) 1: occurring or appearing three times a week
2: occurring or appearing every three weeks -- triweekly adv
[2]triweekly n, pl -lies (1851): a triweekly publication
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012