Dictionary.net

• Ordinary seaman, one not expert or fully skilled; an inferior seaman; in ordinary, in constant service; statedly attending and serving.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.

• adv. According to established rules ; hence, commonly ; usually ; in most cases.

1871 - The Cabinet Dictionary of the English Language