All 5 Uses of

resolution
in
Tess of the d'Urbervilles

A resolution which had surprised herself had brought her into the fields this week for the first time during many months.
Chpt 2

resolution = determination (firmness of purpose)

The struggle was so fearful; her own heart was so strongly on the side of his—two ardent hearts against one poor little conscience— that she tried to fortify her resolution by every means in her power.
Chpt 4 *

Even the "good old family" (to use a favourite phrase of a late local worthy) had no aroma for him unless there were good new resolutions in its representatives.†
Chpt 3 *

Resolutions, reticences, prudences, fears, fell back like a defeated battalion.†
Chpt 3

Definitions:

(1) (resolution as in: a New Year's resolution)
a firm decision to do something
(2) (resolution as in: a United Nations resolution)
a formal statement of decision or opinion voted on by a group

While a resolution typically expresses an opinion and has no legal force, when used in early U.S. history or in the expressions joint resolution of Congress or continuing resolution, it becomes a synonym for legislation (meaning that it carries the force of law).
(3) (resolution as in: Her resolution weakened.)
determination (firmness of purpose)
(4) (resolution as in: resolution of the dispute)
a solution or outcome
(5) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Much less commonly, other meanings of resolution include:
- a measure of optic detail -- as in: "The photograph has excellent resolution."
- separation into different parts -- as in: "When force is applied to an inclined plane there is resolution of the force into horizontal and vertical components."
- conversion to something else -- as in: "... resolution of the chord from dissonance (an unstable sound) to consonance (a more stable sound)."
- reduction to or conversion to something else -- as in: "It permits resolution of a URL to an IP address."