If I am uncertain of something and later I made myself certain again, is there a single word to express that?
"I was uncertain whether the result was correct. But I
re-certained myself by double checking my calculations."
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You could use the word reassure, about which the Oxford Dictionaries says
Say or do something to remove the doubts or fears of (someone)
She's planning to be a volunteer teacher; it reassures me to know she's got such great aspirations.
So you can say
I reassured myself by double checking my calculations.
"I was uncertain whether the result was correct. But I satisfied myself by double checking my calculations."
- a. To free from doubt or question; convince:
- b. To provide sufficient explanation to dispel or answer (a doubt or question).