The general consensus says that polyglot is a person who is able to speak four or more languages (including your native language). But how do you measure the proficiency of this people?
Several organizations have proficiency scales, first, I’ll show one of the best known and my favorite, which is of The Common European Framework of Reference for Languages, from the Council of Europe. There are six levels, divided into A1, A2, B1, B2, C1 and C2.
A1 – Can understand and use familiar everyday expressions and very basic phrases aimed at the satisfaction of needs of a concrete type. Can introduce him/herself and others and can ask and answer questions about personal details such as where he/she lives, people he/she knows and things he/she has. Can interact in a simple way provided the other person talks slowly and clearly and is prepared to help.