Definition
In geometry and drafting, two or more lines that pass through a single common point. In aircraft drawings and structural diagrams, concurrent lines are used to show forces, members, or reference axes that meet at one location.
Plain English
Lines that all cross each other at the same single point.
Context Anchor
Seen in aviation math, aircraft drawings, and simple force diagrams where several lines are shown meeting at one point.
Derivation
From the Latin 'concurrere,' meaning 'to run together.' The lines literally run together to meet at one point.
Why Pilots Care
Knowing this helps you read diagrams correctly: when lines are concurrent, the shared point is the important location.
Analogy
Think of several roads all meeting at one intersection. The roads are like concurrent lines because they all come together at the same place.
Intuition Check
Concurrent does not mean “happening at the same time” here. In this geometry use, it means “meeting at the same point.”
Example Sentence 1
The three force vectors in the diagram are concurrent lines, all meeting at the wing's attachment point.
Example Sentence 2
In the geometry problem the concurrent lines all crossed at the chart's reference point.