soundness
/sˈaʊndnəs/
Word Rarity
Rare
Frequency: Zipf frequency 2.56 in modern English
10
Scrabble Score
9
Letters
2
Syllables
6
Unique Chars
Meaning
noun
The property (of an argument) of not only being valid, but also of having true premises.
Countable; Uncountable
noun
The property of a logical theory that whenever a wff is a theorem then it must also be valid. Symbolically, letting T represent a theory within logic L, this can be represented as the property that whenever T⊢φ is true, then T⊨φ must also be true, for any wff φ of logic L.
Countable; Uncountable
Etymology
From Middle English soundenes, soundnes, from Old English *sundnes, *ġesundnes (attested in onsundnes), from Proto-West Germanic *sundnassī (“soundness, health”); equivalent to sound + -ness. Cognate with West Frisian sûnens (“soundness, health”), Middle Low German suntnisse (“soundness, health”), Middle High German suntnisse (“soundness, health”), German Gesundnis (“health”).