An agreement, upon sufficient consideration , to do or not to do a particular thing. 2 Bl. Comm. 442; 2 Kent, Comm. 449. Justice v. Lang, 42 N. Y. 496, 1 Am. Rep. 576; Edwards v. Kearzey, 96 U. S. 599, 24 L. Ed. 793; Canterberry v. Miller, 76 111. 355. A covenant or agreement between two or more persons, with a lawful consideration or cause. Jacob. A deliberate engagement between competent parties, upon a legal consideration , to do or abstain from doing, some act. Wharton. A contract or agreement is either where a promise is made on one side and assented to on the other; or where two or more persons enter into engagement with each other by a promise on either side. 2 Steph. Comm. 54. A contract is an agreement by which one person obligates himself to another to give, to do. or permit, or not to do. something expressed or implied by such agreement. Civ. Code I,a. art. 1761; Fislc v. Police Jury. 34 La. Ann. 45. A contract is an agreement to do or not to do a certain thing. Civ. Code Cal.