1. (n.) An expression of appreciation or recognition; an admission, avowal or confession\.

2. (n.) The act of owning or recognized in a particular character or relationship; recognition as regards the existence, authority, truth, or genuineness.

3. (n.) The owning of a benefit received; courteous recognition; expression of thanks.

4. (n.) Something given or done in return for a favor, message, etc.

5. (n.) A declaration or avowal of one's own act, to give it legal validity; as, the acknowledgment of a deed before a proper officer. Also, the certificate of the officer attesting such declaration.

abject apology acceptance acknowledgments acquittance admission allowance answer answering antiphon apology appreciation avowal back back answer back matter back talk backchat bastard title benediction bibliography billet blurb boost breast-beating buildup business letter by-line canceled check catch line catchword chit citation cognizance colophon comeback commendation communication concession confession contents contents page contrition copyright page credit credit line crediting declaration dedication discharge dispatch due echo endleaf endpaper endsheet epistle errata evasive reply excuse favor flyleaf folio fore edge foreword front matter good word grace half-title page head honorable mention hymn hype imprint index inscription introduction leaf letter line makeup mea culpa message missive note owning owning up paean page penitence plug praise prayer of thanks preface preliminaries profession promotion puff quittance reaction ready reply receipt receipt in full recognition recto reference regrets rejoinder release repartee replication reply repost rescript rescription respondence response responsion responsory retort return reverberation reverso right riposte rite of confession running title short answer shrift signature snappy comeback subtitle table of contents tail text thank offering thank-you thanks thanksgiving title title page trademark tribute trim size type page unbosoming verso voucher warrant what is owing witty reply witty retort yes-and-no answer