Parallel shift in the yield curve

A shift in the yield curve in which the change in the yield on all maturities is the same number of basis points. In other words, if the 3 month T-bill  increases 100 basis points (one percent), then the 6 month, 1 year, 5 year, 10 year, 20 year, and 30 year rates increase by 100 basis points as well. Related: Non-parallel shift in the yield curve.