A midibus is a classification of single-decker minibuses which generally are larger than a traditional minibus but smaller than a full-size single decker.
Midibuses are often designed to be light weight to save on diesel fuel (e.g. smaller wheels than on larger buses), making them not as durable as heavier 'full size' buses. Some midibuses, such as the Scania OmniTown, are heavier and therefore more durable.
Recently Europe has seen the introduction of the Alexander Dennis Enviro300 and VDL SB200, both predominantly aimed at the UK market which, while being full size buses (in the fact that they are about 12 metres (39 ft 4 in) long), are related to midibuses in being light weight.