Obverse (noun)

1. The front side of a coin, medal, or other item, typically bearing a design or inscription.
2. The side of a coin, medal, or other item that is intended to be the principal or more important side.
3. The first or most prominent aspect of something.

Origin:

Late middle english, from latin obversus "turned towards, opposed," past participle of obvertere "to turn towards," from ob- "towards" + vertere "to turn".

Examples:

1. The obverse of the coin depicted a portrait of the king.
2. The obverse side of the medal was engraved with a motto.
3. The obverse of the situation was the shortage of resources.
4. The obverse of the argument was the need for change.
5. The obverse of the landscape was the rolling hills and forests.