a belief (or system of beliefs) accepted as authoritative by some group or school
"The political debate quickly devolved into a clash between two opposing isms, each claiming to hold the only true path forward."
An ideology, system of thought, or practice that can be described by a word ending in -ism.
"He proudly pinned his newly earned ISM on his uniform after years of distinguished service in the army."
Abbreviation of Imperial Service Medal.
Initialism of Institute for Supply Management.
"The ISM report released today shows that manufacturing activity has finally begun to expand after months of contraction."