[hwair-az, wair-]
while on the contrary: One arrived promptly, whereas the others hung back.
it being the case that, or considering that (used especially in formal preambles).
noun, plural whereases.
a qualifying or introductory statement, especially one having “whereas” as the first word: to read the whereases in the will.

1300–50; Middle English wheras; see where, as1

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whereas (wɛərˈæz)
1.  (coordinating) but on the other hand: I like to go swimming whereas Sheila likes to sail
sentence connector
2.  (in formal documents to begin sentences) it being the case that; since

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Example sentences
Whereas according to the sad and orthodox theories of translation, neither of
  these truths should be true.
Nature has no lines, whereas drawing almost always contains lines.
Large parental age differences increase the risk for psychiatric disorders,
  whereas other environmental factors decrease risk.
But either way, it didn't look at all right to me, whereas the conclusions in
  this paper seem more reasonable.
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