definition of
guarantee

[1] #1 guarantee v. [vouch] give surety or assume responsibility; "I vouch for the quality of my products". wn

[2] #2 guarantee n. [warrant, warrantee, warranty] a written assurance that some product or service will be provided or will meet certain specifications. wn

[3] #3 guarantee v. [ensure, insure, assure, secure] make certain of; "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success!". wn

[4] #4 guarantee v. [undertake] promise to do or accomplish; "guarantee to free the prisoners". wn

[5] #5 guarantee n. an unconditional commitment that something will happen or that something is true; "there is no guarantee that they are not lying". wn