Technology / Aviation / Dead Reckoning: In pioneer flight before radio, beacons, and accurate maps, flying distances much by instinct and guesswork, and referring to whatever landmarks were below, was quite routine. The 'dead' part simply meant 'straight,' as in the nautical 'dead ahead,' and pilots often relied heavily on the IRON COMPASS for cross-country flights over unfamiliar territory.
Dead Adverb Synonyms: completely, entirely, absolutely, totally, abruptly, suddenly
Dead Adjective Synonyms: deceased, defunct, extinct, gone, departed, late, lifeless, no more, done for, gone for a burton
Reckoning Verb Synonyms: counting, calculating, calculation, computation, enumeration, addition
Business / Machine Shop / Dead Smooth: The term applied to the finest cut of a file. MORE
Entertainment / Golf / Dead Weight: (also 'overall weight') the total weight of a golf club (see also 'swingweight') MORE