Definition of poly
(Entry 1 of 3)
: a polymerized plastic or something made of this
especially
: a polyester fiber, fabric, or garment
poly
adjectiveDefinition of poly (Entry 2 of 3)
informal
: polyamorous
"Everybody up there's poly, you know? … You can love more than one person at a time."— Donald Harstad … when you're in a poly relationship, you have to have a higher baseline of communication – you have to deal with problems right away.— Heather Nicoll
poly-
combining formDefinition of poly- (Entry 3 of 3)
1
: many : several : much : multi-
polychotomous polygyny
2a
: containing an indefinite number more than one of a (specified) substance
polysulfide
b
: polymeric : polymer of a (specified) monomer
polyethylene polyadenylic acid
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Merriam-Webster unabridged
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Time Traveler for poly
The first known use of poly was in 1942
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