(adv.) As an auxiliary, will is used to denote futurity dependent on the verb. Thus, in first person, "I will" denotes willingness, consent, promise; and when "will" is emphasized, it denotes determination or fixed purpose; as, I will go if you wish; I will go at all hazards. In the second and third persons, the idea of distinct volition, wish, or purpose is evanescent, and simple certainty is appropriately expressed; as, "You will go," or "He will go," describes a future event as a fact only. To emphasize will denotes (according to the tone or context) certain futurity or fixed determination.
WILL
Meaning of WILL in English
Webster's English dictionary. Английский словарь Webster. 2012