With reference to a command or bequest: Securely, bindingly. Obsolete.

In the manner of an obligation; bindingly.

With reference to commands, obligation, etc.: Rigorously, stringently; with insistence on exact performance, execution, or obedience. Cf. straitly…

In an obligatory manner; so as to be obligatory; by obligation.

In a binding manner, so as to impose obligation; so as to force or constrain. Obsolete.