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ease (n.)

c. 1200, "physical comfort, undisturbed state of the body; tranquility, peace of mind," from Old French aise "comfort, pleasure, well-being; opportunity," which according to Watkins is ultimately from Latin adiacens "lying at," present participle of adiacere "lie at, border upon, lie near," from ad "to" (see ad-) + iacere "to lie, rest," literally "to throw" (from PIE root *ye- "to throw, impel"). Compare adagio.

At ease "at rest, at peace, in comfort" is from late 14c.; as a military order (1802) the word denotes "freedom from stiffness or formality."

ease (v.)

c. 1300, "to help, assist," from Old French aiser, from aise (see ease (n.)). Meaning "to give ease, mitigate, alleviate, relieve from pain or care" is from mid-14c. Meaning "render less difficult" is from 1630s; the sense of "to relax one's efforts" is from 1863 (with up by 1907, earlier with a more specific sense in sailing). Farmer reports ease in a slang sense of "to content a woman" sexually, with an 1861 date. Related: Eased; easing.

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Definitions of ease from WordNet
1
ease (n.)
freedom from difficulty or hardship or effort;
he rose through the ranks with apparent ease
they put it into containers for ease of transportation
Synonyms: easiness / simplicity / simpleness
ease (n.)
a freedom from financial difficulty that promotes a comfortable state;
a life of luxury and ease
Synonyms: comfort
ease (n.)
the condition of being comfortable or relieved (especially after being relieved of distress);
getting it off his conscience gave him some ease
Synonyms: relief
ease (n.)
freedom from constraint or embarrassment;
I am never at ease with strangers
Synonyms: informality
ease (n.)
freedom from activity (work or strain or responsibility);
Synonyms: rest / repose / relaxation
2
ease (v.)
move gently or carefully;
He eased himself into the chair
ease (v.)
lessen pain or discomfort; alleviate;
ease the pain in your legs
Synonyms: comfort
ease (v.)
make easier;
Synonyms: facilitate / alleviate
ease (v.)
lessen the intensity of or calm;
The news eased my conscience
Synonyms: still / allay / relieve
From wordnet.princeton.edu