Polyamory (from Greek πολύ poly, "many, 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. It is distinct from swinging (which emphasizes sex with others as merely recreational) and may or may not include polysexuality (attraction towards multiple genders and/or sexes).
Polyamory, often abbreviated as poly, is often described as "consensual, ethical, and 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. (Full article...)