What is Fairly?

Legal Definition
Justly; rightly; equitably. With substantial correctness. "Fairly" is not synonymous with "truly," and "truly" should not be substituted for it in a commissioner's oath to take testimony fairly. Language may be truly, yet unfairly, reported ; that is, an answer may be truly written down, yet in a manner conveying a different meaning from that intended and conveyed. And language may be fnirly reported, yet not in accordance with strict truth. Lawrence v. Finch, 17 N. J. Eq. 234.
-- Black's Law Dictionary
Legal Definition
Justly; rightly.
-- Ballentine's Law Dictionary