Thereto

Thereto is an archaic adverb that means "to that," "to it," or "in addition to that." It indicates direction or reference to something previously mentioned or understood. It's primarily used in legal, formal, and literary contexts, and is now relatively uncommon in everyday speech and writing. Similar to "therein" or "thereof," it provides a concise way to avoid repetition of the original referent. Its use often suggests a desire for precision and formality. Its meaning is generally context-dependent, relying on the reader or listener's understanding of what "that" refers to.