1) Blow on 2) Classification algorithm 3) Reduce to only the best 4) Separate chaff from grain 5) Separate grain from chaff 6) Separation 7) Sift 8) Sifting 9) Sort in a way 10) To flutter 11) Winnowing 1) Cull 2) Sieve 3) Sift 4) Sifting 5) Winnowing 
• (v. i.) To separate chaff from grain.
Win'now (wĭn'no) transitive verb [ imperfect & past participle Winnowed (-nod); present participle & verbal noun Winnowing .] [ Middle English windewen , winewen , Anglo-Saxon windwian ; akin to Goth. winp...Win'now intransitive verb To separate chaff from grain. « Winnow not with every wind.» Ecclus. v. 9. 
[n] - the act of separating grain from chaff 2. [v] - blow on 3. [v] - separate from chaff 4. [v] - treat by exposure to a current of air so that waste matter is eliminated, as of grain 5. [v] - remove by a current of air, as of chaff
To flap the wings without flying
verb separate the chaff from by using air currents; `She stood there winnowing chaff all day in the field`winnowing noun the act of separating grain from chaff; `the winnowing was done by women`
[SAT terms] the act of separating grain from chaff