that can be relied on to do what you want or need

(a)  

very useful or important

(a)  

that you can get, buy or find

(a)  

agreed or approved of by most people in a society

(a)  

done in order to prepare for something

(a)  

can be eaten

(a)  

very great in amount, scale, or intensity

(a)  

can be changed

(a)  

can be divided

(a)  

requiring or using great effort or exertion

(a)