Noun

1. The condition of failing to meet an obligation.

   You may cure this default by paying the full amount within a week.

2. A loss incurred by failing to compete.

   The team's three losses include one default.

3. A value used when none has been given. Often used attributively, e.g., default value.

   If you don't specify a number of items, the default is 1.

4. The failure of a defendant to appear and answer a summons and complaint.

Verb

1. To fail to meet an obligation.

   You were required to make a payment on the first of the month. You have defaulted.

2. To lose a competition by failing to compete.

   If you refuse to wear a proper uniform, you will not be allowed to compete and will default this match.

3. To assume a value when none was given.

   If you don't specify a number of items, it defaults to 1.

4. To fail to appear and answer a summons and complaint.