1) a beating
2) a beating of the breast with grief, sorrow
3a1) to cause one trouble, make work for him
3b) intense labour united with trouble and toil
Part of Speech: noun masculine
Citing in TDNT: 3:827, 453
From G2875; a cut, that is, (by analogy) toil (as reducing the strength), literally or figuratively; by implication pains: - labour, + trouble, weariness.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root κόπος; click on the second column to search for that grammatical form of the root κόπος; click on the third column to search for that word and grammatical form; click on the total to search for the root κόπος.