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impost1

[im-pohst] /ˈɪm poʊst/
noun
1.
a tax; tribute; duty.
2.
a customs duty.
3.
Horse Racing. the weight assigned to a horse in a race.
verb (used with object)
4.
to determine customs duties on, according to the kind of imports.
Origin
1560-1570
1560-70; < Medieval Latin impostus a tax, noun use of Latin impostus, variant of impositus imposed; see imposition
Related forms
imposter, noun

impost2

[im-pohst] /ˈɪm poʊst/
noun, Architecture
1.
the point of springing of an arch; spring.
2.
an architectural feature immediately beneath this point.
Origin
1655-65; < French imposte < Italian imposta < Latin: feminine of impostus (past participle); see impost1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for imposts

impost1

/ˈɪmpəʊst/
noun
1.
a tax, esp a customs duty
2.
(horse racing) the specific weight that a particular horse must carry in a handicap race
verb
3.
(transitive) (US) to classify (imported goods) according to the duty payable on them
Derived Forms
imposter, noun
Word Origin
C16: from Medieval Latin impostus tax, from Latin impositus imposed; see impose

impost2

/ˈɪmpəʊst/
noun
1.
(architect) a member at the top of a wall, pier, or column that supports an arch, esp one that has a projecting moulding
Word Origin
C17: from French imposte, from Latin impositus placed upon; see impose
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for imposts

impost

n.

"tax, duty," 1560s, from Middle French impost, from Medieval Latin impostum, from neuter of Latin impostus, contracted from impositus, past participle of imponere (see impostor).

Online Etymology Dictionary, © 2010 Douglas Harper
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