Plural - a series of in-game challenges in a video game that can only be completed once a day. The next available 'daily' will be available at the same time the next day (known as 'reset'.) As a reward, the player will receive some type of in-game currency, power, or title
"Hey Brother, want to Raid with me and the boys?" "Sorry, I can't - I'm too busy doing my dailies to get some awesome loot!