converse

2 [adj. kuhn-vurs, kon-vurs; n. kon-vurs]
adjective
1.
opposite or contrary in direction, action, sequence, etc.; turned around.
noun
2.
something opposite or contrary.
3.
Logic.
a.
a proposition obtained from another proposition by conversion.
b.
the relation between two terms, one of which is related to the other in a given manner, as “younger than” to “older than.”
4.
a group of words correlative with a preceding group but having a significant pair of terms interchanged, as “hot in winter but cold in summer” and “cold in winter but hot in summer.”

Origin:
1350–1400; Middle English convers (< Anglo-French) < Latin conversus past participle of convertere to turn around, equivalent to con- con- + vert- turn + -tus past participle suffix; see convert

conversely [kuhn-vurs-lee, kon-vurs-] , adverb
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World English Dictionary
converse1
 
vb (often foll by with)
1.  to engage in conversation (with)
2.  to commune spiritually (with)
3.  obsolete
 a.  to associate; consort
 b.  to have sexual intercourse
 
n
4.  conversation (often in the phrase hold converse with)
5.  obsolete
 a.  fellowship or acquaintance
 b.  sexual intercourse
 
[C16: from Old French converser, from Latin conversārī to keep company with, from conversāre to turn constantly, from vertere to turn]
 
con'verser1
 
n

converse2 (ˈkɒnvɜːs)
 
adj
1.  (prenominal) reversed; opposite; contrary
 
n
2.  something that is opposite or contrary
3.  logic
 a.  a categorical proposition obtained from another by the transposition of subject and predicate, as no bad man is bald from no bald man is bad
 b.  a proposition so derived, possibly by weakening a universal proposition to the corresponding particular, as some socialists are rich from all rich men are socialists
4.  logic, maths a relation that holds between two relata only when a given relation holds between them in reverse order: thus father of is the converse of son of
 
[C16: from Latin conversus turned around; see converse1]

conversely (ˈkɒnvɜːslɪ)
 
adv
(sentence modifier) in a contrary or opposite way; on the other hand

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

converse
"to communicate (with)," 1590s; earlier "to move about" (mid-14c.), from O.Fr. converser (12c.), from L. conversari (see conversation). Related: Conversing.

converse
"exact opposite," 1570, from L. conversus "turn around," pp. of convertere "to turn about" (see convert). Originally mathematical. Related: Conversely (1806).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Conversely, at depths where little sunlight penetrates, the algae nestle right
  inside the coral's pigment bundles.
Conversely, common lore is that when the body gets chilled, it is more
  vulnerable to illness.
Conversely, some memories have high retrieval strength but low storage strength.
And, conversely, the perception of rhythm in things external to oneself is both
  easy and pleasurable.
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