What does the word "interior" mean?

The word interior means inside part, inner area, or inner nature of something, opposite of exterior which means outside. As noun, interior means inside space or inner part, for example interior of house means rooms inside house, interior of car means cabin where passengers sit, interior of box means space inside box. As adjective, interior means located inside or inner, for example interior walls are walls inside building, interior paint is paint made for inside use, interior designer is person who designs inside spaces. In architecture and home design, interior refers to design and decoration of inside spaces including walls, floors, ceilings, furniture, colors, and lighting. In geography, interior means inland area away from coast, as interior of country. In personal sense, interior can mean inner thoughts, feelings, or character, as interior life. So interior generally means inside, inner part, or inner space. For example, building exterior is brick but interior is modern means outside is brick and inside is modern. It comes from Latin interior meaning inner or more within. So interior always refers to what is inside rather than outside.