Dyad (sociology)

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A dyad (from Greek dýo, "two") in sociology mostly refers to parents and friends, occasionally to twins.

Dyadic friendships refer to the most immediate and concrete level of peer interaction, which is expanded to include new forms of relationships in adolescence - most notably, romantic and sexual relationships. Already Ferdinand Tönnies treated it as a special pattern of gemeinschaft, 1887, as community of spirit.

See as well Triad (sociology).