From Longman Dictionary of Contemporary Englishmidweekmid‧week /ˌmɪdˈwiːk◂ $ ˈmɪdwiːk/ adjective, adverb TMCon one of the middle days of the week There are often discounts available for midweek travel. —midweek noun [uncountable] The match will be played in midweek.
Examples from the Corpus
midweek• A meeting is scheduled for midweek.• Many resorts offer midweek discounts. 