Canon

n. Japanese corporation founded in 1937 and headquartered in Tokyo, world-renowned manufacturer of a wide variety of optical and imaging products (such as cameras, lenses, digital video cameras, etc.) and business machines (such as printers, copy machines, computer printers, laser facsimiles, etc.)

n. church law; accepted principle, criterion; list of Christian saints; books of the Bible recognized by the Christian church; clergyman, religious cleric; (Music) contrapuntal piece of music in which one musical line of a melody is imitated in an accurate manner in other parts

n. canyon, channel, gully, deep narrow valley

Canon from Greek kanon "rule" (perhaps originally from kanna "reed", cognate to cane) is used in various meanings in fields of knowledge as diverse as literature, medicine, music and religion. It is usually used to refer to (in some sense of) "accepted" or "official" (official version, official meaning, etc.) with the adjective canonical being the form encountered as often than not.
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For the song, see CANYON.MID. For the band, see Canyon (band). A canyon (rarely cañon) or gorge is a deep valley between cliffs often carved from the landscape by a river. Most canyons were formed by a process of long-time erosion from a plateau level. The cliffs form because harder rock strata that are resistant to erosion and weathering remain exposed on the valley walls. Canyons are much more common in arid areas than in wetter areas because weathering has a lesser effect in arid zones. Canyon walls are often formed of resistant sandstones or granite.  Submarine canyons are those which form underwater, generally at the mouths of rivers. The word canyon is Spanish in origin (cañón). The word canyon is generally used in the United States, while the word gorge is more common in Europe and Oceania, though it is also used in some parts of the United States and Canada. The rare word defile is occasionally used in England.
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Noun
1. a rule or especially body of rules or principles generally established as valid and fundamental in a field or art or philosophy; "the neoclassical canon"; "canons of polite society"
(hypernym) rule, prescript
2. a priest who is a member of a cathedral chapter
(hypernym) priest
(hyponym) prebendary
3. a ravine formed by a river in an area with little rainfall
(synonym) canyon
(hypernym) ravine
(part-meronym) canyonside
(classification) North America
4. a contrapuntal piece of music in which a melody in one part is imitated exactly in other parts
(hypernym) musical composition, opus, composition, piece, piece of music
(hyponym) enigma canon, enigmatic canon, enigmatical canon, riddle canon
5. a complete list of saints that have been recognized by the Roman Catholic Church
(hypernym) list, listing
(derivation) canonize, canonise, saint
6. a collection of books accepted as holy scripture especially the books of the Bible recognized by any Christian church as genuine and inspired
(hypernym) scripture, sacred scripture

n. gun, cannon; barrel; model, example (Informal); stunner, one who is strikingly handsome or beautiful

n. canyon

n. canon, dogma; doctrine

n. pipe, tube; barrel; cannon; gun; stem; quill; canyon, gorge