- Of or relating to quanta, quantum mechanics, or a quantized system.
- Existing in only one of two possible states.
- Of or designating an all-or-none response or effect.
- Of or pertaining to a <xref>quantum</xref>
- Describing a <xref>response</xref> that is <xref>all-or-none</xref>
- of or relating to a quantum or capable of existing in only one of two states