hyperconjugation

This term is a specialized technical expression used almost exclusively within organic chemistry. It describes a specific electronic effect that explains why certain molecular structures, such as tertiary carbocations, are more stable than others. It is a more subtle form of electron delocalization than resonance, involving sigma bonds rather than pi systems.

As a technical scientific term, it is treated as an uncountable noun. It refers to a chemical phenomenon or process rather than a discrete object, meaning it does not have a plural form in standard chemical discourse.