valuate C2+

/ˈvæljuˌeɪt/ to estimate the worth or value of something; to appraise

unvaluable C2+

/ʌnˈvæljuəbəl/ beyond price; of inestimable worth (archaic for invaluable)

valuation C2+

/ˌvæljuˈeɪʃən/ an estimation of the worth or monetary value of something

validate C2+

/ˈvælɪdeɪt/ to confirm the accuracy, validity, or legitimacy of something

validness C2+

/ˈvælɪdnəs/ the quality of being valid, sound, or well-founded