Ante-ceded means to come before or precede. Its opposite is to come after or follow, and the word for this is post-ceded. For example, if Smith's appointment follows that of Johnson, then Johnson post-ceded Smith's appointment. Another antonym for ante-ceded is outstrip, which means to surpass or outdo something that has come before it. In contrast, ante-ceded implies that the thing that came before dictated or influenced what came next. The word 'simultaneous' can also be considered an antonym for ante-ceded, as it refers to two or more events occurring at the same time.