The word 'warming' is a transparent English formation built directly upon the Old English adjective 'wearm', which itself descends from the Proto-Germanic warmaz, meaning 'warm'. This Germanic root is further traced to the Proto-Indo-European gʷʰer-, meaning 'warm, hot', a root also giving rise to words like 'thermal' and 'furnace' via Greek and Latin. The addition of the nominal suffix '-ing', from Old English '-ung', converts the adjective into a noun denoting the action or process associated with the base word. Thus, the literal construction 'the process of making or becoming warm' has remained semantically consistent from its Old English origins to its modern abstract and climatic applications.

Structure: warm + ing - warm (Old English 'wearm'): The core root meaning 'moderately hot'. - ing (Old English '-ung', '-ing'): A suffix forming verbal nouns indicating an action, process, or result.