homoconjugation

  1. [obsolete]Association between a base and its conjugate acid through a hydrogen bond (B ... HB+ or AH ... A). Homoassociation is a more appropriate term for this phenomenon.
  2. The orbital overlap of two π-systems separated by a non-conjugating group, such as CH2.
Source:
PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1121