Webster's English Dictionary

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log

1. log \'lo.g, 'la:g\ n [ME logge, prob. of Scand origin; akin to ON la-g 
   fallen tree; a] often attrib kin to OE licgan to lie - more at LIE 1: a 
   usu. bulky piece or length of unshaped timber; esp : a length  of a tree 
   trunk ready for sawing and over six feet long 2: an apparatus for measuring 
   the rate of a ship's motion through the water  consisting of a block 
   fastened to a line and run out from a reel 3a: the record of the rate of a 
   ship's speed or of her daily progress; a lso : the full nautical record of 
   a ship's voyage 3b: the full record of a flight by an aircraft  4: any 
   record of performance 
2. log vb or logged;  or log.ging 1: to cut (trees) for lumber or to clear 
   (land) of trees in lumbering  2: to enter details of or about in a log  3a: 
   to move (an indicated distance) or attain (an indicated speed) as note d in 
   a log 3b1: to sail a ship or fly an airplane for (an indicated distance)  
   3b2: to have (an indicated record) to one's credit  : LUMBER 
3. log n : LOGARITHM