resignationは苦渋の決断をして辞める感じ?
quitは中途半端で辞める感じかな?

resignation
【noun】
1.[uncountable, countable]
〔仕事の〕辞職、退職、退陣
the act of giving up your job or position; the occasion when you do this
:a letter of resignation(O)
:There were calls for her resignation from the board of directors.(O)
:Further resignations are expected.(O)
:The defeat led to his resignation as team manager.(O)
:The governor refused to accept Cox's resignation.(L)
:accept sb's resignation (C)
:If you say you're leaving, I won't accept your resignation.(C)
:The cuts triggered a wave of resignations.(C)
:a resignation letter/letter of resignation(C)

●Japan Times:FEB 7, 2013
Land parliamentary secretary resigned over sex scandal involving a minor
The abrupt resignation of the land ministry’s parliamentary secretary, Takeshi Tokuda, on Monday was the result of a sex scandal involving a minor, according to the weekly magazine Shukan Shincho.
(omit)
Farm minister Toshikatsu Matsuoka hanged himself in early 2007 amid a scandal, and his successor, Norihiko Akagi, quit in August 2007 amid a financial scandal, paving the way for Abe’s resignation a month later.
The opposition camp hasn’t gone full throttle over Tokuda’s resignation, at least not yet.
(omit)
“I am completely unaware of the details so I can’t comment” about the resignation, Hosono, who himself was involved in a scandal involving a female newscaster in 2006, told reporters.


●BBC:13 February 2013
Pope Benedict thanks public for 'love and prayers'
Pope Benedict XVI has thanked the public for their "love and prayers", as he made his first public appearance since announcing his resignation.
(omit)
The pontiff said in his resignation statement on Monday: "After having repeatedly examined my conscience before God, I have come to the certainty that my strengths, due to an advanced age, are no longer suited to an adequate exercise of the Petrine ministry."



2.[countable]
〔正式な〕辞表、辞職願
a letter, for example to your employers, to say that you are giving up your job or position
:to offer/hand in/tender your resignation(O)
:We haven't received his resignation yet.(O)
:give in/hand in/offer your resignation (C)
:I resolved to hand in my resignation on Tuesday.(C)

●Japan Times:FEB 6, 2010
Sumo failed to keep champ in check
That’s why I suspect the association pressured Asashoryu to hand in his resignation,” he said.

●BBC:29 January 2013
Netherlands profile
2012 April - Prime Minister Mark Rutte tenders the resignation of his cabinet after the right-wing Freedom Party refuses to support an austerity budget.


3. [uncountable]
〔無抵抗の〕受容、屈服、服従
when someone calmly accepts a situation that cannot be changed, even though it is bad
:She gave a sigh of resignation.(L)
:with resignation(L)
:He accepted her decision with resignation.(L)
:They accepted their defeat with resignation.(O)
:An experienced investor would accept these minor disappointments with resignation.(C)

●Japan Times:FEB 16, 2010
Steps toward nuke-free world
But no matter how great the divide between our ideals and reality, there is no need to give up hope or accept this with resignation.


●BBC:18 November 2004
Living in Somalia's anarchy
We can't afford to send them to school," says Ladan Barow Nur with resignation, as she cooks chapattis for the evening meal on an open fire just outside her tent.