Definition of log noun from the Oxford Advanced Learner's Dictionary

     

    log

     noun
    noun
    BrE BrE//lɒɡ//
     
    ; NAmE NAmE//lɔːɡ//
     
    , NAmE//lɑːɡ//
     
    Plane travel, Travelling by boat or ship
     
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  1. 1a thick piece of wood that is cut from or has fallen from a tree logs for the fire
  2. 2(also logbook) an official record of events during a particular period of time, especially a journey on a ship or plane The captain keeps a log. See related entries: Plane travel, Travelling by boat or ship
  3. 3(informal) = logarithm
  4. Word Originnoun senses 1 to 2 Middle English (in the sense ‘bulky mass of wood’): of unknown origin; perhaps symbolic of the notion of heaviness.Extra examples I added another log to the fire. I checked the server’s error logs. She kept a log of their voyage. The fire is dying down—would you throw on another log? The lawyers will review phone logs and other records. The road was blocked by fallen logs. They haul the logs into the sawmill. This feature continuously updates the log as data is written. a pile of sawn logs logs crackling in the fireplace A senior officer made a note in the ship’s log. She quickly checked the log. The captain’s log stopped abruptly in May 1944. They keep a log of any accidents that occur at work.Idioms
    as easy as anything/as pie/as ABC/as falling off a log
     
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    (informal) very easy or very easily Fooling him was as easy as falling off a log.
    (informal) to sleep very well
See the Oxford Advanced American Dictionary entry: log