Part of speech: Noun
the act of limiting movement or making incapable of movement
Example: the storm caused complete immobilization of the rescue team
Part of speech: Noun
fixation (as by a plaster cast) of a body part in order to promote proper healing
Example: immobilization of the injured knee was necessary
The word "immobilisation" comes from French immobilisation.
French spelling conventions explain many of English's 'silent letters' and irregular spellings.