Something believed; a proposition or set of propositions held to be true. In early usage esp.: a doctrine forming part of a religious system; a set…

Belief; faith, trust.

gen. A creed or formula of belief; a statement of the aims or principles which guide a person's conduct.

transferred. A system of belief in general; a set of opinions on any subject, e.g. politics or science.

A system of (non-religious) belief; a set of firmly held principles, ideals, or beliefs; a creed. Usually with modifying word.

The body of opinion, esp. on religious matters, formulated or laid down authoritatively or assertively; systematized belief; tenets or principles…

a set of principles, ideas, or convictions which together form a tenable thesis, working ethos, or presiding ideology; esp. a religion or…

Outlook or world view with respect to spiritual matters or concerns; spiritual belief, practice, or teaching in any religious or philosophical…

any or every kind of ‘ism’ (as a final term in an enumeration of ‘isms’).