"Ulteriorly" is a relatively uncommon word that means "later" or "subsequently." While it is not used very often, there are multiple synonyms one can use in its place. For instance, "later on," "eventually," "subsequently," or "afterward" can all be used to express the same idea. Additionally, phrases such as "at a later date," "in the future," or "down the line" can be used to convey a similar message. It is important to choose words that clearly convey the intended meaning in order to avoid confusion or ambiguity in written or spoken communication.