Longman Dictionary of Contemporary English homepage

meaningful

adjective
     
mean‧ing‧ful
1 having a meaning that is easy to understand and makes sense:
Without more data we cannot make a meaningful comparison of the two systems.
Teaching history to five-year-olds in a meaningful way can be very difficult.
meaningful to
Rules must be put in a context that is meaningful to the children.
2

meaningful look/glance/smile etc

a look that clearly expresses the way someone feels, even though nothing is said:
Sam and Barbara exchanged meaningful glances.
3 serious, important, or useful:
They want a chance to do meaningful work.
I want a mature and meaningful relationship.
a meaningful conversation
meaningfully adverb

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