All 3 Uses of

accord
in
This Side of Paradise

He remembered that an alumnus of the nineties had told him of one of Booth Tarkington's amusements: standing in mid-campus in the small hours and singing tenor songs to the stars, arousing mingled emotions in the couched undergraduates according to the sentiment of their moods.†
Chpt 1.2 *

according to = as stated by; or in agreement with

According to the American novels we are led to believe that the 'healthy American boy' from nineteen to twenty-five is an entirely sexless animal.†
Chpt 2.2

My own idleness was quite in accord with my system, but the luck broke.†
Chpt 1.3 *

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