exact

[ig-zakt]
adjective
1.
strictly accurate or correct: an exact likeness; an exact description.
2.
precise, as opposed to approximate: the exact sum; the exact date.
3.
admitting of no deviation, as laws or discipline; strict or rigorous.
4.
capable of the greatest precision: exact instruments.
5.
characterized by or using strict accuracy: an exact thinker.
6.
Mathematics. (of a differential equation) noting that the collection of all terms, equated to zero, is an exact differential.
verb (used with object)
7.
to call for, demand, or require: to exact respect from one's children.
8.
to force or compel the payment, yielding, or performance of: to exact money; to exact tribute from a conquered people.

Origin:
1400–50; late Middle English exacten (v.) < Latin exāctus (past participle of exigere drive out, thrust out), equivalent to ex- ex-1 + ag(ere) to drive + -tus past participle suffix

exactable, adjective
exacter, exactor, noun
exactness, noun
nonexactable, adjective
preexact, adjective, verb (used with object)
quasi-exact, adjective
quasi-exactly, adverb
unexacted, adjective


3. rigid, severe, unbending. 5. methodical, careful, punctilious, demanding, scrupulous. 8. wring. See extract.


1, 2. imprecise.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
exact (ɪɡˈzækt)
 
adj
1.  correct in every detail; strictly accurate: an exact copy
2.  precise, as opposed to approximate; neither more nor less: the exact sum
3.  (prenominal) specific; particular: this exact spot
4.  operating with very great precision: exact instruments
5.  allowing no deviation from a standard; rigorous; strict: an exact mind
6.  based mainly on measurement and the formulation of laws, as opposed to description and classification: physics is an exact science
 
vb
7.  to force or compel (payment or performance); extort: to exact tribute
8.  to demand as a right; insist upon: to exact respect from one's employees
9.  to call for or require: this work exacts careful effort
 
[C16: from Latin exactus driven out, from exigere to drive forth, from agere to drive]
 
ex'actable
 
adj
 
ex'actness
 
n
 
ex'actor
 
n
 
ex'acter
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

exact
"precise, rigorous, accurate," 1530s, from L. exactus, pp. of exigere, lit. "to drive or force out," also "demand, finish, measure," from ex- "out" + agere "drive, lead, act" (see act). The verb (late 14c., implied in exaction) is older in English and represents the literal
sense of the Latin. Related: Exacted.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Obviously not all church-connected colleges insist on exact subscription to
  their own particular beliefs.
The exact causality can only be speculated at this point but the correlations
  are robust.
To get an exact measure of these distances, have students use the blue nylon
  straps included in the trunk.
What makes a wine develop the exact flavors it does over time remains largely a
  mystery.
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