In terms of position:
* Back: This is the most common synonym, referring to the rear or hind part of something.
* Rear: Similar to "back", but often used when referring to the back of a vehicle or a group of people.
* Behind: Indicates something located at the back or in the back of something else.
* Following: Used when referring to something that comes after something else in time or sequence.
In terms of probability:
* Inferential: This refers to the process of drawing conclusions based on evidence or observations.
* Likely: Suggests that something is probable or has a high chance of occurring.
* Probable: Similar to "likely", it indicates something is more likely to happen than not.
In terms of medical terminology:
* Dorsal: Refers to the back or upper surface of an animal or structure.
* Caudal: Means relating to the tail or hind end of an animal.
In a broader sense:
* Subsequent: This word refers to something that happens or comes after something else.
* Following: Similar to "subsequent," but can also refer to something that is located behind something else.
To provide the most accurate synonym, please give me the context in which "posterior" is being used.