The letters '-ic' aren't a root. Instead, they're a suffix that comes into English by way of ancient, classical Latin and the even earlier, ancient, classical Greek. In Latin, the suffix is '-icus'. In the earlier Greek, the suffix is '-ikos'. Either way, the meaning is the same: 'having the character or form of' or 'of or relating to'.
The suffix for kinetic is -ic.
GREEK
There is no prefix in electricity. The suffix is -icity, made up of the adjective suffix -ic and the Latin noun suffix -ity.
The Latin suffix for "dependent" is "-ent" which means "tending to" or "having the quality of." In Greek, the equivalent suffix is "-ent" which also indicates possession of a certain quality or condition.
The suffix for idiopathic is "-ic" which means "pertaining to."
The suffix "-ist" is of Latin origin, not Greek. It is commonly used to form agent nouns, referring to people who hold certain beliefs or engage in certain practices.
A Greek or Latin suffix is an affix added to the end of a word to change its meaning or grammatical function. These suffixes often indicate parts of speech, such as turning a noun into an adjective or a verb into a noun.
The suffix "-ness" is of Germanic origin, not Latin or Greek. It is commonly used in English to form abstract nouns indicating a state, condition, or quality. The suffix has been borrowed and adapted from Old English and Old High German languages.
The suffix of "authentic" is "-ic."
The suffix in "dramatic" is "-ic".
The suffix of antigenic is -ic.