"Interior refinement" refers to the process of making the inside of something, such as a room or a car, more appealing, stylish, and comfortable by adding or improving its design, furniture, decoration, and overall appearance. Full definition
The 2015 Fit will deliver above - class interior refinement and features while offering value at every trim level. (hondanews.com)
In April 2014, the QX80 arrived at the New York International Auto Show with a moderate refresh, receiving new headlights and taillights with new front and rear fascias, restyled bi-xenon HID projector headlamps with LED daytime running lights, front LED turn signals (located on front bumper with new LED fog lights), new wheel designs (including a new 22 - inch forged - aluminum version), three new exterior colors, and a number of interior refinements for the 2015 model year. (en.wikipedia.org)
BMW will update its Z4 roadster with a series of subtle exterior and interior refinements for the 2014 model year. (autoweek.com)