Cases of word usage

1) a method of physical exercise with music (aerobics)

2) (a method of, key to) secret writing (cipher)

3) (to use) a method to test if (a calculation, process etc) is accurate by doing it a different way (crosscheck)

4) (of a law, method etc) no longer used (defunct)

5) of the method of holding land (by giving services to the owner) as in Europe until four hundred years ago (feudal)

6) (the method of) growing plants in water without soil (hydroponics)

7) (of) a person who paints or writes using this method (impressionist)

8) the act of introducing knowledge or experience, e.g. to a person beginning a new job; a method of reasoning which obtains general laws from particular facts or examples (induction)

9) a Japanese method of fighting using blows made with the sides of the hands, foot, head or elbow (karate)

10) the scientific method of organized reasoning; (a person's ability to think and express thoughts systematically (logic)