Yes, default is playable
...and is worth 13 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Default" Definition
noun
A situation or condition that obtains in the absence of active intervention.
Computer Science A particular setting or value for a variable that is assigned automatically by an operating system and remains in effect unless canceled or overridden by the operator: changed the default for the font in the word processing program.
Failure to perform a task or fulfill an obligation, especially failure to meet a financial obligation: in default on a loan.
Law Failure to make a required court appearance.
The failure of one or more competitors or teams to participate in a contest: won the championship by default.
idiom
In default of Through the failure, absence, or lack of.
verb-intransitive
Law To fail to appear in court when summoned.
Law To lose a case by not appearing.
To fail to do what is required.
To fail to pay money when it is due.
To fail to take part in or complete a scheduled contest.
verb-transitive
Law To lose (a case) by failing to appear in court.
To fail to perform or pay.
To fail to take part in or complete (a contest, for example).
verb
to fail to fulfill a contract, agreement, or duty as.
To fail to meet a financial obligation .
To fail to appear in court.
To fail to compete in or to finish an appointed contest.
To forfeit a contest by such failure .
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