What do s, m, w, m-w, and w-s mean in the context of infrared spectroscopy?
Given the general agreement surrounding my comment on the question and the similar abbreviations and descriptions in the chart on the page linked by Tyberius in his comment, the meanings appear to be:


strong
moderate (or medium)
weak


Notations such as m-w and w-s presumably indicate a peak intensity that is variable in the indicated range, depending on the properties of the particular molecule of interest.