Deflation. The geometric interpretation of the 'deflation' step in the PLS Algorithm. This 'Deflation' effectively removes one dimension by projecting the data onto a subspace that is one dimension less than the row number of the current data matrix, and orthogonal to the vector Wm.
Land et al. BMC Systems Biology 2011 5(Suppl 3):S13 doi:10.1186/1752-0509-5-S3-S13