Language is any system of communication that exists to establish shared meaning. Even within a single language, one term can mean something in situation A and something different in situation B. We call this a homograph. For example, the word pool can mean a swimming pool, shooting pool, or a betting pool.
Perception is the process of considering, and interpreting something. Perception is subjective like truth is. Something that’s beautiful to one person may be an eyesore to another. For example, many designers would describe the busy, colorful patterns in the carpets of Las Vegas as gaudy. People who frequent casinos often describe them as beautiful.
However good or bad these carpet choices seem to us, there are reasons why they look that way. Las Vegas carpets are busy and colorful to disguise spills and wear and tear from foot traffic. Gamblers likely enjoy how they look because of an association with an activity that they enjoy. For Las Vegas casino owners and their customers, those carpet designs are good. For designers, they’re bad. Neither side is right. Both sides have an opinion.
What we intend to do determines how we define words like good and bad.