Word for definition: make a person believe by arguing or showing facts?

Theresa B

New member
Doing a crossword, and cannot find out the words for it! The first word has 8 letters and o as the second letter.

Also:

the method or skill used to in accomplishing a goal
(has 9 letters and i is the 6th letter)

in ancient Roman law, everyone should be treated equally
(has 9 letters and L is the 3rd letter)

Thank you!!
 
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