The word 一路 is formed by combining the character 一 (yī), meaning "one", with 路 (lù), meaning "road" or "path". It is a conceptual fusion where the literal notion of "a single road" is abstracted to imply continuity and singularity of direction. This creates the core idea of an unbroken, consistent course, whether spatial, temporal, or metaphorical, giving rise to its meanings related to "the whole journey", "all the way", or "throughout". The formation is essentially a direct and intuitive figurative extension from a physical path to a broader, sustained progression.