How do you spell Obverse

Available Definitions:
1)  a. - Having the base, or end next the attachment, narrower than the top, as a leaf.
2)  a. - The face of a coin which has the principal image or inscription upon it; -- the other side being the reverse.
3)  a. - Anything necessarily involved in, or answering to, another; the more apparent or conspicuous of two possible sides, or of two corresponding things.