The Collaborative International Dictionary of English v.0.48:

Obi \O"bi\, n. [Prob. of African origin.]
   1. A species of sorcery, probably of African origin,
      practiced among the negroes of the West Indies. [Written
      also obe and obeah.] --De Quincey. --B. Edwards.
      [1913 Webster]

   2. A charm or fetich. [West Indies] --B. Edwards.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Obi \O"bi\ ([=o]"b[-e]), n. [Jap.]
   A sash, esp. the long belt-like broad sash of soft material
   worn by women aound the waist when wearing a traditional
   kimono, and usually having a large bow at the back.
   [Webster 1913 Suppl.]

         Over this is bound the large sash (obi) which is the
         chief article of feminine adornment.     --B. H.
                                                  Chamberlain.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

obi
    n 1: (West Indies) followers of a religious system involving
         witchcraft and sorcery [syn: obeah, obi]
    2: a religious belief of African origin involving witchcraft and
       sorcery; practiced in parts of the West Indies and tropical
       Americas [syn: obeah, obi]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

OBI
       Open Buying on the Internet (Internet, WWW)