-ism, -ismus

(Greek, ismos; Latin, ismus: a suffix: belief in, practice of, condition of, process, characteristic behavior or manner, abnormal state, distinctive feature or trait)

monopsychism (s) (noun), monopsychisms (pl)
The theory, or theories, that all souls (or the souls of all mankind) are one: "There is a unity of souls of all humans according to this concept of monopsychism."
monorchism
The condition of having only one testicle.
monotheism (s) (noun), monotheisms (pl)
The belief that there is only one God: "This belief of monotheism is found; for example, in Judaism, Christianity, and Islam."
moralism
moronism
A mildly mentally retarded condition or behavior.
morphinism
1. A morbid condition caused by an excessive dose or habitual use of morphine.
2. A pathological state caused by morphine addiction.
morphism
In mathematics, a class of elements which together with objects form a category.

In most cases, morphisms are functions which preserve some structure on a set.

multilateralism
The principle or belief that several nations should be cooperatively involved in the process of achieving some goal.
multipletheism (s) (noun), multipletheisms (pl)
The belief in the existence of various gods or of many gods.
municipalism
The principle, system, or advocacy of home rule by a municipality.
mutism (s) (noun), mutisms (pl)
A refusal or inability to speak either at all times or on specific occasions, which may indicate trauma or stress: David is experiencing many mutisms even though he would like to converse with his wife and children.
myoseism
Nonrhythmic spasmodic muscular contractions.
myriotheism (s) (noun), myriotheisms (pl)
The worshiping of or believing in more than one deity (god), usually many deities: "Myriotheism and polytheism both refer to the worship of many gods."
myrmecophilism
1. Thriving in association with ants; used with reference to organisms that spend part of their life cycle in ant or termite nests.
2. Having a symbiotic relationship with ants.
myrmecophytism
A plant that has specialized structures for sheltering ants or termites, or having a mutual interdependence with ants or termites.