week·night 
/ˈwi:kˌnaɪt/ noun
plural week·nights /ˈwi:kˌnaɪt/ noun [count] : the evenings of Monday through Friday : any evening except Saturday or Sunday evening
▪ The news is on every weeknight at 10 p.m. ▪ Her parents don't want her to be out that late on a weeknight.
▪ The news is on every weeknight at 10 p.m. ▪ Her parents don't want her to be out that late on a weeknight.
— week·nights /ˈwi:kˌnaɪts/ adverb
▪ We watch the news weeknights at 6 p.m.
/ˈwi:kˌnaɪts/ adverb ▪ We watch the news weeknights at 6 p.m.
