A language which no longer has any native speakers, particularly (archaic) Latin and Ancient Greek.

Unswervingly dedicated; resolutely determined. / (Australia, colloquial) Complete and utter; total.

(hunting) The rigid pose a hunting dog assumes when pointing out game to a hunter. / A fixed or stationary condition arising from obstacle or hindrance; a deadlock.

plural of dead heat

Very tired; completely exhausted.

(espionage) A location used to secretly pass items between two people, without requiring them to meet.

To leave at a dead drop for someone else to retrieve.

plural of dead ringer

plural of dead language

(compilers) Instructions that, when executed, have no effect on the running of the program. / (programming) A portion of source code that will never be executed as part of the running program.