Definitions from Wiktionary (UFO)

▸ noun:  (colloquial) An "unfinished object" in knitting or other kinds of craft.
▸ noun:  A UFO.
▸ noun:  Initialism of unidentified flying object; (loosely) an alien spacecraft. [Anything not readily explainable appearing to move through or be suspended in the air, primarily used to refer to objects that seem to be at least of small and familiar aircraft size.]
▸ noun:  (astronomy) Initialism of ultrared flattened object.
▸ Also see ufo

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