Definition of quantum valebant in US English:

quantum valebant

noun

US
Law
  • (An action to recover) the reasonable value of goods which have been provided or delivered without a legally enforceable contract stipulating a price.

adjective

US
Law
  • Of or designating (an action to recover) the reasonable value of goods.

Origin

Early 18th century. From post-classical Latin quantum valebant as much as they were worth (apparently not attested in Latin context) from classical Latin quantum which amount + valēbant, 3rd plural imperfect indicative of valēre to be worth.

Pronunciation

quantum valebant

/ˌkwɒntəm vaˈleɪbant/