All 3 Uses of

accord

in

Hamlet, Prince of Denmark

Marry, sir, here's my drift; And I believe it is a fetch of warrant: You laying these slight sullies on my son As 'twere a thing a little soil'd i' the working, Mark you, Your party in converse, him you would sound, Having ever seen in the prenominate crimes The youth you breathe of guilty, be assur'd He closes with you in this consequence; 'Good sir,' or so; or 'friend,' or 'gentleman'— According to the phrase or the addition Of man and country.†
Scene 2.1

according to = as stated by; or in agreement with

—Madam, come; This gentle and unforc'd accord of Hamlet Sits smiling to my heart: in grace whereof, No jocund health that Denmark drinks to-day But the great cannon to the clouds shall tell; And the king's rouse the heaven shall bruit again, Re-speaking earthly thunder.†
Scene 1.2

Definitions:

(1) (accord as in: according to, or in accord with)
in keeping with; or in agreement/harmony/unity with
This meaning of accord is often seen in the form according to or accordingly where it can take on more specific meanings. For example:
- "According to Kim, ..." -- as stated by
- "To each according to her ability." -- based upon
- "Points are scored according to how well they perform." -- depending upon
- "The dose is calculated according to body weight." -- in proportion to
- "We got a flat tire. Accordingly, I pulled to the side of the road." -- because of what was just said; or as a result
(2) (accord as in: reached an accord)
an agreement

In this sense, accord can refer to a formal agreement (such as one written between two countries) or an informal agreement (such as an unvoiced consensus about what should be done).
(3) (accord as in: done of her own accord)
mind

This sense of accord is typically seen in the form own accord or one accord.
(4) (accord as in: accord her the respect deserved)
to give someone special treatment -- especially respect
(5) (meaning too rare to warrant focus)