Purposeful
Part of speech: adjective
Definition: Having purpose; intentional. Having a purpose in mind; resolute; determined.
Example sentence: Every person has a longing to be significant; to make a contribution; to be a part of something noble and purposeful.
Meaningful
Part of speech: adjective
Definition: Having meaning, significant.
Example sentence: Old friends pass away, new friends appear. It is just like the days. An old day passes, a new day arrives. The important thing is to make it meaningful: a meaningful friend - or a meaningful day.