Mid 17th century; earliest use found in Anthony Burgess (d. 1664), clergyman and ejected minister. From classical Latin faciendum thing to be done (usually in plural, facienda), use as noun of neuter gerundive of facere to make, do.
Definition of faciendum in US English:
faciendum
noun
Philosophy
A thing that should be done.
Origin
Mid 17th century; earliest use found in Anthony Burgess (d. 1664), clergyman and ejected minister. From classical Latin faciendum thing to be done (usually in plural, facienda), use as noun of neuter gerundive of facere to make, do.