-ac -ic -al are the common ones.
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The suffix that means pertaining to is "-al".
The suffix for idiopathic is "-ic" which means "pertaining to."
state of being
The suffix -tal usually means "pertaining to" or "having the quality of." For example, the word "musical" means pertaining to music, and "hospital" means a place that has the quality of hospitality.
The suffix al means being, of or pertaining to.