Definitions from Wiktionary ( )

▸ noun:  A small, usually yellow, finch (genus Serinus), a songbird native to the Canary Islands.
▸ noun:  Any of various small birds of different countries, most of which are largely yellow in colour.
▸ noun:  (informal) A female singer, soprano, a coloratura singer.
▸ noun:  (slang) An informer or snitch; a squealer.
▸ noun:  A light, slightly greenish, yellow colour.
▸ noun:  (slang) A (usually yellow) capsule of the short-acting barbiturate pentobarbital/pentobarbitone (Nembutal).
▸ noun:  (Australia, informal) A yellow sticker applied by the police to a vehicle to indicate it is unroadworthy.
▸ noun:  Any test subject, especially an inadvertent or unwilling one. (From the mining practice of using canaries to detect dangerous gases.)
▸ noun:  (computing) A value placed in memory such that it will be the first data corrupted by a buffer overflow, allowing the program to identify and recover from it.
▸ noun:  (computing) A change that is tested by being rolled out first to a subset of machines or users before rolling out to all.
▸ noun:  (countable, uncountable) A light, sweet, white wine from the Canary Islands.
▸ noun:  A lively dance, possibly of Spanish origin (also called canaries).
▸ noun:  (UK, slang, obsolete) A sovereign (coin).
▸ noun:  (public transport) A previously-issued ticket, retained by a ticket-seller, conductor or driver and resold to a subsequent passenger as a means of defrauding the transport company.
▸ adjective:  Of a light yellow colour.
▸ verb:  (intransitive) To dance nimbly (as in the canary dance).
▸ verb:  (slang) To inform or snitch, to betray secrets, especially about illegal activities.
▸ verb:  (software engineering) To test a software change by rolling out to a small set of machines or users before making it available to all.
▸ noun:  (soccer) Someone connected with Norwich City Football Club, as a fan, player, coach etc.
▸ adjective:  (finance, of an option) That can be exercised on quarterly dates, a set time period (usually one year) after the issue date, and before the expiry date.

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