Sobriety, n.
Etymology: [L. sobrietas: cf. F. sobriété. See Sober.]
1. Habitual soberness or temperance as to the use of spirituous liquors; as, a man of sobriety. Public sobriety is a relative duty. Blackstone.
2. Habitual freedom from enthusiasm, inordinate passion, or overheated imagination; calmness; coolness; gravity; seriousness; as, the sobriety of riper years. Mirth makes them not mad, Nor sobriety sad. Denham.
Syn. -- Soberness; temperance; abstinence; abstemiousness; moderation; regularity; steadness; calmness; coolness; sober-mindeness; sedateness; staidness; gravity; seriousness; solemnity.
Shades of meaning
Fernald has no entry of its own for sobriety; he lists it under abstinence.
Where he writes about it:
Sobriety and temperance signify maintaining a quiet, even temper by moderate indulgence in some things, complete abstinence from others. — from abstinence