It is often assumed that the emergence of a new concept can be traced to the appearance of a new word in a language. The aim of this article is to show that the process is more complex than this by examining the evolution of a number of words and contexts in the field of high altitude topography, when high mountains were being explored for the first time. This is a lexical field of a somewhat special nature, relating to a reality that had always been visible, but had never been described before. While there are undoubtedly examples where a concept crystallises around a newly adopted word, the norm is a slow process of uncertainty and hesitation.