(n.) An agreement so made; specifically, an agreement, league, or contract between two or more nations or sovereigns, formally signed by commissioners properly authorized, and solemnly ratified by the several sovereigns, or the supreme power of each state; an agreement between two or more independent states; as, a treaty of peace; a treaty of alliance.

(2):

(n.) A proposal tending to an agreement.

(3):

(n.) A treatise; a tract.

(4):

(n.) The act of treating for the adjustment of differences, as for forming an agreement; negotiation.

Bibliography Information
Webster, Noah. Entry for 'Treaty'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/t/treaty.html. 1828.

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Webster's Dictionary

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Treaty