The Collaborative International Dictionary of English v.0.48:

Ism \Ism\, n. [See ism, above.]
   A doctrine or theory; especially, a wild or visionary theory.
   --E. Everett.
   [1913 Webster]

         The world grew light-headed, and forth came a spawn of
         isms which no man can number.            --S. G.
                                                  Goodrich.
   Ismaelian

The Collaborative International Dictionary of English v.0.48:

-ism \-ism\ [F. -isme, or L. -ismus, Gr. ?.]
   A suffix indicating an act, a process, the result of an act
   or a process, a state; also, a characteristic (as a theory,
   doctrine, idiom, etc.); as, baptism, galvanism, organism,
   hypnotism, socialism, sensualism, Anglicism.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ism
    n 1: a belief (or system of beliefs) accepted as authoritative
         by some group or school [syn: doctrine, philosophy,
         philosophical system, school of thought, ism]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "ism":
   Weltanschauung, adherents, articles of religion, catechism, church,
   class, communion, confession, credenda, credo, creed, cult,
   cultism, denomination, disciples, doctrinal statement, faith,
   followers, formulated belief, gospel, ideology, mystique, order,
   persuasion, political faith, political philosophy, religion,
   school, sect, system of belief, world view



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

ISM
       Industrial, Science, Medical [ = 2,4 GHz ] (WLAN)


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

ISM
       InterSystems M (MUMPS, InterSytems)


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

ISM
       Intel Server Management (Intel)