Merriam-Webster Online Dictionary
precedent (adjective) in time, order, arrangement, or significance - prior
1.
an earlier occurrence of something similar
2.
a) something done or said that may serve as an or rule to authorize or justify a subsequent act of the same or an kind - example analogous a verdict that had no precedent
b) the convention established by such a precedent or by long practice
3.
a person or thing that serves as a model
Merriam-Webster Online Thesaurus
precedent (adjective)going before another in time or order
SYNONYMS:
antecedent, anterior, foregoing, former, precedent, preceding, priorRELATED WORDS:
advance, early, premature; earliest, first, inaugural, initial, maiden, original, pioneer; preexisting; introductory, preliminary; erstwhile, whilomNEAR ANTONYMS:
advanced, late; closing, concluding, final, last, latest, latter, terminal, ultimate