Available Definitions:
1) a. - Tending, or causing, to approach the center.
2) a. - Expanding first at the base of the inflorescence, and proceeding in order towards the summit.
3) a. - Having the radicle turned toward the axis of the fruit, as some embryos.
4) a. - Progressing by changes from the exterior of a thing toward its center; as, the centripetal calcification of a bone.