Having the quality or purpose of sustaining something; providing sustenance or support; relating to sustentation.
Origin
Early 17th century; earliest use found in Thomas Jackson. From post-classical Latin sustentativus from classical Latin sustentāt-, past participial stem of sustentāre + -īvus.
Definition of sustentative in US English:
sustentative
adjective
Having the quality or purpose of sustaining something; providing sustenance or support; relating to sustentation.
Origin
Early 17th century; earliest use found in Thomas Jackson. From post-classical Latin sustentativus from classical Latin sustentāt-, past participial stem of sustentāre + -īvus.