- 2Meaning: important
- 3Meaning: necessaryessential indispensable required
- 4Meaning: binding
- 5Meaning: property
- 6Meaning: usefulessential invaluable beneficial
- 7Meaning: required
- 8Meaning: rudiment
- 9Meaning: fundamentalcardinal elementary essential
- 10Meaning: requirement
- 14Meaning: necessity