Definitions from Wiktionary (Y)

▸ noun:  A figure or mark in the shape of the letter Y.
▸ noun:  A Y-shaped object, such as a railroad fork or a support for a telescope; a wye, a bifurcation.
▸ noun:  (lepidopterology) A moth of the genus Plusia, having markings resembling the letter Y.
▸ noun:  (Canada, US, informal) A particular facility run by the YMCA/YWCA.
▸ noun:  Abbreviation of year. [A period of time akin to the time taken for the Earth to undergo a full cycle of seasons.]
▸ noun:  (UK, television) Abbreviation of youth, usually followed by an age appropriate for the content so marked. [(uncountable) The quality or state of being young.]
▸ noun:  (computing) Abbreviation of yes. [An affirmative expression; an answer that shows agreement or acceptance.]
▸ adverb:  (slang, text messaging, Internet slang) Abbreviation of why. [(interrogative) For what cause, reason, or purpose.]
▸ noun:  Abbreviation of year. (In some contexts as YY or YYYY to indicate only the last 2-digits or all 4-digits.) [A period of time akin to the time taken for the Earth to undergo a full cycle of seasons.]
▸ noun:  (Stenoscript) Abbreviation of year. [A period of time akin to the time taken for the Earth to undergo a full cycle of seasons.]
▸ noun:  (Canada, US) Clipping of the YMCA or YWCA.
▸ noun:  Obsolete form of IJ (“a lake (formerly a bay) adjoining the city of Amsterdam, Netherlands”). [A lake (formerly a bay) adjoining the city of Amsterdam, Netherlands.]

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