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Contraction of are: They're not at home.
(Grammar) are: we're; you're; they're.
the musical syllable used for the second tone in the ascending diatonic scale.
[1400–50; late Middle English; see gamut]
with reference to; regarding.
[1700–10; < Latin rē (in the) matter, affair, thing (abl. of rēs)]
contraction of are: They're leaving.
a prefix, occurring orig. in loanwords from Latin, used to form verbs denoting action in a backward direction (recede; return; revert), action in answer to or intended to undo a situation (rebel; remove; respond; restore; revoke), or action done over, often with the implication that the outcome of the original action was in some way impermanent or inadequate, or that the performance of the new action brings back an earlier state of affairs (recapture; reoccur; repossess; retype). Also, red-.
[Middle English < Latin re-, red-]