A meaningful sentence is one that adds value to a paragraph by bringing in information. The sentence delivers a logical fact in addition to good subject-verb agreement, spelling and grammar. Every sentence must be written for a purpose, specifically to provide supporting facts.
The content of the sentence must add meaning. When a sentence lacks significance to the story and the reader, it does not convey the purpose for which it is written. It is always good for one to read a sentence for clarity, purpose and meaning, to ensure that it makes sense. In long essays, it is desirable to hire a proof-reader to go though the work before publishing it.