Transitional
The deliberate midpoint between traditional and contemporary: period silhouettes stripped of ornament, or contemporary forms softened with classical proportion.
transitional, transitional style, Transitional Style
Defined only relative to two other terms, which is unusual and was nearly grounds to refuse it. It stays because it is heavily used in the US consumer market and because the relative definition is the honest one - the term genuinely means "between those two" and pretending otherwise would invent content nobody intends.