げつよう
noun
Monday (short form)
time-day-of-week
1. Monday; Mon.
The clipped form of 月曜日(げつようび), used where the day is already understood as a day of the week — schedules, timetables, calendars, and casual speech.
月曜(げつよう)(やす)です。
Monday is a day off.
The meeting was moved to Monday morning.
この(みせ)月曜(げつよう)から金曜(きんよう)まで営業(えいぎょう)しています
This shop is open from Monday through Friday.

Shortened from 月曜日(げつようび) by dropping (). The full form is the default in careful speech and writing; the short form appears where space is tight or the context is obvious.

Common collocations

Usage

All seven days clip the same way (火曜(かよう), 水曜(すいよう), 木曜(もくよう), 金曜(きんよう), 土曜(どよう), 日曜(にちよう)). In tables and signs the reading is often abbreviated further to the single kanji (げつ).