What is the Latin root mark?

The Latin root "mark" doesn't exist on its own. However, there are several Latin roots that contribute to words with the meaning of "mark":

* "signum": This root means "sign, mark, signal". It gives rise to words like "sign," "signal," "signature," and "designate".

* "nota": This root means "mark, note, brand." It contributes to words like "note," "annotate," "denote," and "notice".

* "stigma": This root means "mark, brand, tattoo". It appears in words like "stigma," "stigmatize," and "stigmatic".

Therefore, depending on the specific word you are considering, the relevant Latin root might be "signum", "nota", or "stigma".