instantaneous
adjective
in·stan·ta·neous
ˌin(t)-stən-ˈtā-nē-əs
-nyəs
1
: done, occurring, or acting without any perceptible duration of time
death was instantaneous
2
: done without any delay being purposely introduced
took instantaneous corrective action
3
: occurring or present at a particular instant
instantaneous velocity
instantaneousness
noun
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Merriam-Webster unabridged
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