The term used for an enlargement of a construction feature that is not fully detailed in other drawings is "detail." In carpentry and architecture, a detail refers to a specific part of a construction project that provides a clear, enlarged view of that feature, including all necessary dimensions, materials, and connections. This allows builders and craftsmen to understand exactly how to construct that feature correctly, ensuring clarity and accuracy in execution.
Details are essential in construction drawings as they provide critical information that may not be conveyed in the general plans or elevations. They often clarify complex junctions or components, like joinery methods or the intersection of different materials, which require precision but might be overlooked in broader views.
The other terms do not fit this definition. Draft typically refers to a preliminary version of a drawing, blueprint refers to a reproduction of a technical drawing, and outline signifies a general description or summary, which does not convey the level of specificity that a detail provides in construction documentation.