Design Glossary of Terms

Perceptual -adjective
of, pertaining to, or involving perception
Semantics -noun 
the meaning, or an interpretation of the meaning, of a word, sign, sentence, etc.

Aesthetics -noun
the study of the mind and emotions in relation to the sense of beauty.
Maquette -noun
a small model or study in three dimensions for either a sculptural or an architectural project.
Orthography -noun
the art of writing words with the proper letters, according to accepted usage; correct spelling.