I. noun
( -es )
Etymology: Middle English strangenesse, from strange (I) + -nesse -ness
: the quality or state of being strange
II. noun
1. : a quantum characteristic of subatomic particles that accounts for the relatively long lifetime of certain particles and is conserved in interactions involving electromagnetism and the strong force
2. or strangeness number : a quantum number that expresses the strangeness of a particle and has a value of zero for most known particles