to make good use of;  to use to one's advantage
 scope;  valid range;  coverage
 term of validity;  expiration date (of medicine, credit card, etc.)
 term of validity;  period for which something is valid (e.g. ticket)
 ratio of job openings to job applicants
 significant figures;  significant digits
 least significant bit;  LSB
 most significant bit;  MSB
 effective data transfer rate
 effective population size
 Law for the Promotion of Utilization of Recycled Resources