1. relating to length or the lengthwise dimension of something
2. relating to longitude on the Earth’s surface
Usage: geography
3. conducted over an extended period of time to track changes
Usage: research; statistics

Examples

• The longitudinal beam runs the entire length of the building.
• She made a longitudinal cut along the vegetable.
• The map shows longitudinal lines running from pole to pole.
• The longitudinal study followed patients for twenty years.
• Researchers collected longitudinal data on student performance.
• The ship’s longitudinal stability was excellent in rough seas.
• Longitudinal research helps identify long-term trends.