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retardation
noun
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How to pronounce retardation:

Definition of retardation:

retardation (noun):
a decrease in rate of change.
an act or instance of retarding

Synonyms for retardation:

backwardness
belatedness
braking
change
deceleration
decline
delay
downshift
drop
ebb
lag
lateness
letup
mental retardation
modification
remission
retardant
retardent
retreat
slowdown
slowing
slowness
slump
subnormality
tardiness
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Antonyms for retardation:

acceleration
advance
aid
assistance
beginning
boon
boost
breakthrough
continuation
go
harm
hastening
help
hurt
increase
injury
liberation
peace
permeability
promotion
quickening
rise
speed-up
start
support
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Other 4-syllable words

Here are some other common 4-syllable words.

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