"Etymology Morganatic, not used in English until 1727 (OED), is derived from the medieval Latin morganaticus from the Late Latin phrase matrimonium ad morganaticam and refers to the gift given by the groom to the bride on the morning after the wedding, morning gift, i.e. dower. The Latin term applied to a Germanic custom, was adopted from a Germanic term, *morgangeba (compare Early English morgengifu and German Morgengabe). The literal meaning is explained in a 16th century passage quoted by Du Cange, a marriage by which the wife and the children that may be born are gift.[2] Meyers Konversations-Lexikon of 1888 gives an etymology of the German term Morganitische Ehe [3] as a combination of the ancient Gothic morgjan, to limit, to restrict, occasioned by the restricted gifts from the groom in such a marriage and the morning gift. Morgen is the German word for morning, while the Latin word is matutinus." Source: http://en.wikipedia.org/wiki/Morganatic_marriage

Of, or pertaining to Morgan Freeman.

As per the Oxford dictionary - of a marriage between a person of high rank and one of lower rank, the spouse having no claim to the title or possessions of the person of higher rank. In other words, when the richer spouse dies, the widow(er) and orphans would not inherit the property/possessions of the deceased spouse.

between people of different social ranks: describes a marriage in which neither the spouse of lower social rank nor any children of the marriage may inherit the title or possessions of the higher-ranking spouse [Late 16th century. Directly or via French or German< medieval Latin (matrimonium ad) morganaticam "(marriage for the) morning-gift" (the bridegroom's gift to the bride, which relieved him of further responsibility)] http://encarta.msn.com/encnet/features/dictionary/DictionaryResults.aspx?refid=1861631228 adjective (of a marriage) between a man of high rank and a woman of low rank who retains her former status, their children having no claim to the father’s possessions or title. — ORIGIN from Latin matrimonium ad morganaticam ‘marriage with a morning gift’ (because a gift given by a husband on the morning after the marriage was the wife’s sole entitlement). http://www.askoxford.com/concise_oed/morganatic?view=uk Etymology: New Latin matrimonium ad morganaticam, literally, marriage with morning gift Of, relating to, or being a marriage between a member of a royal or noble family and a person of inferior rank in which the rank of the inferior partner remains unchanged and the children of the marriage do not succeed to the titles, fiefs, or entailed property of the parent of higher rank. http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=morganatic http://www.bartleby.com/61/21/M0422100.html of or pertaining to a form of marriage in which a person of high rank, as a member of the nobility, marries someone of lower station with the stipulation that neither the low-ranking spouse nor their children, if any, will have any claim to the titles or entailed property of the high-ranking partner. http://www.infoplease.com/dictionary/morganatic of or designating a form of marriage between a titled aristocrat and a commoner, with the provision that the title and property involved may pass neither to the untitled partner nor to any children of the marriage. http://www.wordsmyth.net/live/home.php?script=search&matchent=morganatic&matchtype=exact