jìng is a bound character - it does not stand alone in modern Mandarin. Two semantic clusters: (1) Pacification / suppression of unrest -
绥靖 (appease, pacify; also the loaded political term 'appeasement' as in 'Munich appeasement'),
靖乱 (suppress rebellion),
靖国 (pacify the nation). (2) Peaceful / tranquil -
安靖 (peace, stability). The historical
靖难之役 (Jingnan Campaign, 1399-1402) was the civil war in which the Yongle Emperor seized the Ming throne.