Meaning

• (now uncommon or literary) To wish, desire (something).

  "Do what you will."

• (nowadays rare) To wish or desire (that something happen); to intend (that).

• (auxiliary) To habitually do (a given action).

• (auxiliary) To choose to (do something); used to express intention but without any temporal connotations (+ bare infinitive), often in negation.

  "I’ve told him three times, but he won’t take his medicine."

• (auxiliary) Used to express the future tense, sometimes with some implication of volition when used in the first person. Compare shall.

• (auxiliary) To be able to, to have the capacity to.

  "Unfortunately, only one of these gloves will actually fit over my hand."

• (auxiliary) Expressing a present tense with some conditional or subjective weakening: "will turn out to", "must by inference".