Priority
Verbs
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precede, come before
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forerun
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go before etc. (lead) [Going before.] Precession
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preexist
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dawn
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presage etc. Prediction
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herald, usher in. be beforehand etc. (be early) Earliness
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steal a march upon, anticipate, forestall
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have the start, gain the start.
Adjectives
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prior, previous
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preceding, precedent
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anterior, antecedent
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pre-existing, pre-existent
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former, foregoing
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aforementioned, before-mentioned, abovementioned
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aforesaid, said
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introductory etc. (precursory) Precursor.
Adverbs
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before, prior to
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earlier
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previously etc. adj.
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afore, aforehand, beforehand, ere, theretofore, erewhile
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ere then, ere now, before then, before now
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erewhile, already, yet, beforehand
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on the eve of.