Behaviour according to prescribed or customary rules; observance of etiquette, ceremony, or decorum. in (full, great) form: with due ceremony. Often…

Solemnly, ceremoniously. Now rare.

In a ceremonious manner; formally, in due form; with strict observance of formalities; †in accordance with the Ceremonial Law (obsolete).

Ceremoniously, formally; with ceremony or civility; = complimentally, adv.

In a ceremonial manner; in relation to ceremonies or the ceremonial law.

In a complimental manner; as a matter of form; by way of compliment.

As adv. Solemnly. rare.