√vaj 'be strong'
[present: vajati etc. ]secondary: causative: vAj/ayati etc. vAjay/ant vAjay/aDyE derivatives: v/Aja V.+ -vAjana S. /ojas V.+ oja- RV. /ojizWa V.B. /ojIyas V.B. ojm/an V. ugr/a V.+ v/ajra V.+ The verbal forms are really denominative, from vAja.