noun-plural. Grateful feelings or thoughts; gratitude: a heart full of thanks for our escape. noun-plural. An expression of gratitude: gave thanks to God; a note of thanks to a contributor. interjection. Used to express thanks.idiom. no thanks to Without the benefit of help from: finally found the house, no thanks to these confusing directions. idiom. thanks to On account of; because of: "our national good fortune in having avoided, thanks to the religion clauses of the First Amendment, the dismal possibilities of religious censorship” ( Benno C. Schmidt, Jr.)