Flanged railway wheel. A flange is an external or internal ridge, or rim (lip), for strength, as the flange of an iron beam such as an I-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera; or for a flange of a rail car or tram wheel.
noun, plural subtleties. 1. the state or quality of being subtle. 2. delicacy or nicety of character or meaning. 3. acuteness or penetration of mind; delicacy of discrimination. 4. a fine-drawn distinction; refinement of reasoning: the subtleties of logic.
The definition of propinquity is nearness in place or time, or similarity of nature. 1  An example of propinquity is the nearness of a slaughterhouse to a hotel, making it difficult to rent rooms. 2  An example of propinquity is the shared mannerisms of two sisters. 3  nearness in time or place.  nearness of relationship; kinship.