Asset

google

ref

mid 16th century (in the plural in the sense ‘sufficient estate to allow discharge of a will’): from an Anglo-Norman French legal term, from Old French asez ‘enough’, based on Latin ad ‘to’ + satis ‘enough’.

wiktionary

ref

Back-formation from  assets, from Anglo-Norman asetz, from Old French assez(“enough”). Compare Middle English asseth. 

etymonline

ref

asset (n.)

a 19c. artificial singular of assets (q.v.).