Определение letterboxed в Английский Язык Английский Язык словарь
{s} (Video) displayed in letterbox format, displayed only across the center of a screen with black bands at the top and bottom (so the wider film format will fit the different dimensions of a TV screen)
when a film from the cinema is broadcast on television with black bands at the top and bottom of the television screen so that the film will have the same dimensions as it did on a cinema screen