Definitions of Sy:
- name: A surname (common: 1 in 100000 families; popularity rank in the U.S.: #18425)
- noun: (astronomy) Abbreviation of Seyfert galaxy., a type of AGN class of active galaxy.
- noun: Alternative form of Si [A diminutive of the male given name Simon.]
- noun: Initialism of steam yacht: steam-powered yacht
- noun: Initialism of sailing yacht: wind-powered yacht
- noun: Initialism of school year. [(education) The academic year of a school.]
(Definitions from Wiktionary)
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