What does interior mean?

Interior means the inside part, inner area, or inner nature of something, opposite of exterior which is outside. As a noun, interior refers to the inside space, for example interior of a house means all rooms inside, interior of a car means cabin where passengers sit, interior of a box means space inside box. As an adjective, interior means located inside or inner, for example interior walls are walls inside house not outside, interior paint is paint made for inside, 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, character, as interior life. So interior generally means inside, inner part, or inner space. For example, the building's exterior is brick but interior is modern and bright means outside is brick and inside is modern. It is used for physical spaces and figurative inner nature, always referring to what is inside rather than outside.