Reciprocal

• Hybrid (biology)
• Hyperbolic spiral
• Multiplicative inverse
• Reciprocal Public License
• Reciprocal altruism
• Reciprocal averaging
• Reciprocal construction
• Reciprocal cross
• Reciprocal determinism
• Reciprocal lattice
• Reciprocal length
• Reciprocal license
• Reciprocal link
• Reciprocal polynomial
• Reciprocal rule
• Reciprocating engine
• Reciprocating oscillation
• Reciprocation (disambiguation)
• Reciprocity (disambiguation)
• Sherrington's law of reciprocal innervation
• aircraft heading