What is Polyamory?

Polyamory (from Greek πολύ [poly, meaning many or several] and Latin amor [love]) is the practice, desire, or acceptance of having more than one intimate relationship at a time with the knowledge and consent of everyone involved.

Polyamory, often abbreviated as poly, is often described as consensual, ethical, or responsible non-monogamy. The word is sometimes used in a broader sense to refer to sexual or romantic relationships that are not sexually exclusive, though there is disagreement on how broadly it applies; an emphasis on ethics, honesty, and transparency all around is widely regarded as the crucial defining characteristic.

The term "polyamorous" can refer to the nature of a relationship at some point in time or to a philosophy or relationship orientation (much like gender or sexual orientation). It is sometimes used as an umbrella term that covers various forms of multiple relationships; polyamorous arrangements are varied, reflecting the choices and philosophies of the individuals involved.

Source: http://en.wikipedia.org/wiki/Polyamory