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There is some controversy about how many languages should someone speak, in order to be considered a polyglot. Bilinguals are not polyglots, that is for sure. Learning many languages, in parellel or consecutive form is not enough. I think a polyglot is someone who has the ability to use at least three languages, shifting from one to the other in an almost unconscious way. One more thing: a polyglot is someone who refuses to share the method he/she uses for comparing the languages involved.
If you learn the meaning of the prefix poly- then anything more than one, so yes bilingual are polyglot by definition