assured; assuring
Definition of assure
1
: to make sure or certain : convince
glancing back to assure himself no one was following
2
: to inform positively
I assure you that we can do it.
3
: to make certain the coming or attainment of : guarantee
worked hard to assure accuracy
4
: to make safe (as from risks or against overthrow) : insure
assured the security of the country
5
: to give confidence to
And hereby we know that we are of the truth, and shall assure our hearts … — 1 John 3:19 (King James Version)
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Merriam-Webster unabridged
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Time Traveler for assure
The first known use of assure was in the 14th century
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