fundamental
a. to develop the use of, make the best use of
b. a person to whom one owns money
c. pay back to somebody for the expenses he has spent
d. that must be done
e. very important
f. capacity that can move or be moved easily and quickly from place to place
g. recurring in cycles
h. category
i. make an agreement or a treaty officially valid by signing it
j. a special right to an inventor to be the only person to make and sell, or to authorize others to make and sell a newly-invented machine or process
e
