1) a rod or straight piece of rounded wood to which any thing is fastened to keep it straight
1a) used for various purposes
1a1) a measuring rod, rule
1a2) a carpenter's line or measuring tape
1a3) the measure of a leap, as in the Olympic games
2) a definitely bounded or fixed space within the limits of which one's power of influence is confined
2a) the province assigned one
2b) one's sphere of activity
3) metaphorically any rule or standard, a principle or law of investigating, judging, living, acting
Part of Speech: noun masculine
Citing in TDNT: 3:596, 414
Fromκάνη kanê (a straight reed, that is, rod); a rule ("canon"), that is, (figuratively) a standard (of faith and practice); by implication a boundary, that is, (figuratively) a sphere (of activity): - line, rule.
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 κανών; click on the second column to search for that grammatical form of the root κανών; click on the third column to search for that word and grammatical form; click on the total to search for the root κανών.