Ébauche refers to the set of raw, unfinished components of a watch movement, which are produced by specialized manufacturers and supplied to watchmakers for further assembly and finishing. In the world of horology, an ébauche typically includes the basic parts necessary for a watch movement, such as the main plate, bridges, gear train, and sometimes the escapement. These components are not yet assembled or finely adjusted, allowing watchmakers to customize and refine them according to their specific requirements and standards.

The use of ébauches allows watchmakers to focus on the artistry and precision of finishing and assembling the movement, rather than the initial production of each individual part. This practice has been particularly prevalent in the Swiss watch industry, where many renowned brands have historically relied on ébauche manufacturers to supply the foundational elements of their timepieces. By starting with an ébauche, watchmakers can ensure a high level of craftsmanship and quality control, as they can apply their expertise in regulating, decorating, and assembling the movement to achieve the desired performance and aesthetic. The term "ébauche" underscores the collaborative nature of watchmaking, where different specialists contribute to the creation of a finely crafted timepiece.