A　new　concept　named　＂rotating　magnetocaloric　effect　(RMCE)＂　has　been　proposed　and　attracted　more　attention　recently.　Unlike　the　traditional　MCE　that　is　achieved　by　moving　the　magnetic　refrigerant　in　and　out　of　magnetic　field,　RMCE　can　be　realized　by　rotating　the　anisotropic　material　within　the　static　field,　thus　implying　the　possible　higher　efficiency　and　simpler　device.　However,　most　studies　on　RMCE　are　concentrated　on　single　crystals,　which　are　generally　more　expensive　and　difficult　to　prepare　in　comparison　with　polycrystals.　Therefore,　it　is　highly　desirable　to　search　polycrystalline　materials　with　high　RMCE.　Here,　the　textured　HoNiSi　polycrystal　is　reported　to　show　a　giant　RMCE,　e.g.,　the　rotating　magnetic　entropy　change　(-Delta　S-R)　are　18.5　and　26.7　J/kg　K　and　rotating　adiabatic　temperature　change　(Delta　T-R)　are　7.0　and　13.4　K　under　2　and　5　T,　respectively.　This　giant　RMCE　over　a　wide　temperature　range　especially　under　low　field　suggests　textured　HoNiSi　as　promising　material　for　practical　application　of　rotary　magnetic　refrigeration.　Moreover,　the　large　magnetic　anisotropy　of　HoNiSi　is　explained　by　the　single-ion　magnetic　anisotropy　theory,　and　the　coherent　orientation　of　crystallographic　texture　and　rare-earth　ion　moments　leads　to　the　large　RMCE　in　the　textured　HoNiSi　polycrystal.　This　work　reveals　that　the　strongly　coherent　orientation　of　crystallographic　texture　and　rare-earth　ion　moments　is　a　key　to　realize　large　RMCE　in　polycrystalline　materials.　(C)　2020　Acta　Materialia　Inc.　Published　by　Elsevier　Ltd.　All　rights　reserved.