initial

/ɪˈnɪʃəl/ verb [T] (initialling or US usually initialing, initialled or US usually initialed)

Definition

› to write the first letters of each of your names on an official document to show that you have read it and agree with it: Initial and date each page of the contract.

› to discuss and agree to an arrangement with another organization, country, etc.: The two nations used the summit to initial a deal on energy cooperation.

(Definition of initial verb from the Cambridge Business English Dictionary © Cambridge University Press)