Rarefied

[rair-uh-fahyd] /ˈrɛər əˌfaɪd/

adjective
1.
extremely high or elevated; lofty; exalted:
the rarefied atmosphere of a scholarly symposium.
2.
of, belonging to, or appealing to an exclusive group; select; esoteric:
rarefied tastes.
[rair-uh-fahy] /ˈrɛər əˌfaɪ/
verb (used with object), rarefied, rarefying.
1.
to make rare or rarer; make less dense:
to rarefy a gas.
2.
to make more refined, spiritual, or exalted.
verb (used without object), rarefied, rarefying.
3.
to become rare or less dense; become thinned:
Moisture rarefies when heated.
/ˈrɛərɪˌfaɪd/
adjective
1.
exalted in nature or character; lofty: a rarefied spiritual existence
2.
current within only a small group; esoteric or exclusive
3.
(of a gas, esp the atmosphere at high altitudes) having a low density; thin
/ˈrɛərɪˌfaɪ/
verb -fies, -fying, -fied
1.
to make or become rarer or less dense; thin out
v.

late 14c., from Old French rarefier (14c.) and directly from Medieval Latin rarificare, from Latin rarefacere “make rare,” from rarus “rare, thin” (see rare (adj.1)) + facere “to make” (see factitious). Related: Rarefied.