The document defines and provides examples of semantic relations among sentences including connotation vs denotation, paraphrasing, entailment, contradiction, and labeling. Connotation refers to emotional associations of a word while denotation is the literal meaning. Paraphrasing means sentences have the same meaning but different forms. Entailment is when the truth of one sentence implies another but not vice versa. Contradiction means if one sentence is true, the other must be false. Labeling is describing something with a short phrase.