Natural Sciences
- Reciprocity (engineering), used in the analysis of structures and to resolve complex load conditions
- Reciprocity (electromagnetism), theorems relating sources and the resulting fields in classical electromagnetism
- Reciprocity (network theory), theorem about transfer function of passive networks
- Reciprocity in network, measures the tendency of vertex pairs to form mutual connections between each other
- Reciprocity of twist and wrench, in screw theory
- Reciprocity theorem (disambiguation), several unrelated results
- Antenna_(radio)#Reciprocity, in transmitting and receiving
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