复数：triweeklies
1.三星期一次(的);一星期三次(的)
1.三周刊;一星期三次的出版物
1.occurring, published, or performed once every three weeks
2.occurring, published, or performed three times each week
1.once every three weeks
2.three times each week
1.a publication that comes out every three weeks
2.a publication that comes out three times each week
triweekliestriweekliestriweeklies