This article will discuss the conditions that define the intermediate European city at the beginning of the twenty-first century: the mid-size, other or secondary city as it many times appears in the relevant bibliography, although these terms fail to capture its full potential. We argue that the intermediate European city cannot simply be defined by parameters like population number, territorial extension, or other forms of scale. Instead, we propose an interpretation through categories of conditions from various scientific disciplines covering different perspectives, as provided by our network members. These conditions suggest a systematization of phenomena commonly manifested in the urban contexts under examination. The article aims to get closer to defining what an intermediate city is or is not, concluding with the concrete illustration of seven selected conditions: scale as a commodity, gravity, perceptual coherence, open-ended image, walkable distances, parochial realm and against fragmentability.