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This cannot rigorously be described as sigma-pi conjugation since sigma and pi here refer to different defining planes, and interaction between orbitals of different symmetries (with respect to the same defining plane) is forbidden.
Wiktionary (0.00 / 0 votes) Rate this definition: pi (Noun). The name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek. pi (Noun). An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.1415926535897932384626433832795; usually written u03C0.