Definition of reckon
1a
: count
reckon the days till Christmas
c
: to determine by reference to a fixed basis
the existence of the U.S. is reckoned from the Declaration of Independence
2
: to regard or think of as : consider
1
: to settle accounts
2
: to make a calculation
4
: to accept something as certain : place reliance
I reckon on your promise to help
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Merriam-Webster unabridged
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Time Traveler for reckon
The first known use of reckon was in the 13th century
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