[[Latin]] ''vacillāt''-, participial stem of ''vacillāre'' to sway, stagger, totter, etc., whence also French ''vaciller'' (1314), Italian ''vacillare'', Portuguese ''vacillar'', Spanish ''vacilar'' | [[Latin]] ''vacillāt''-, participial stem of ''vacillāre'' to sway, stagger, totter, etc., whence also French ''vaciller'' (1314), Italian ''vacillare'', Portuguese ''vacillar'', Spanish ''vacilar'' |