many-to-many

Mutual multiple linkages

Many-to-many describes a relationship where multiple items on one side connect to multiple items on the other.

In databases, a many-to-many relationship links records across tables: Students enroll in many courses, and each course has many students.

The term appears in technical contexts—data modeling, network architecture, communication systems—wherever connections aren't simple one-to-one or one-to-many mappings.

database

cardinality

Size of a set

schema · multiplicity · bidirectional

networks

peer-to-peer

Serverless network architecture

nodes · decentralized · graph · web · multipoint · interlinked · hub-and-spoke · federated · swarm · multiplex

exchange

barter

Direct goods-for-goods exchange

cross-pollination · counterparty

relationships

polyamory

Consensual multiple romantic relationships

multi-partner · constellation · interconnected · web · network

business

consortium

Cooperative group for ventures

cooperative · cross-licensing · syndicate · coalition · multilateral · conglomerate · interorganizational

Opposites
relationship cardinality

many-to-manyone-to-one

Exactly paired correspondence

one-to-many · many-to-one · monogamous

Family

many, one-to-many, many-to-one, one-to-one

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