To engage in mental activity without being distracted by noise.

Free jazz music, as associated with the black civil rights movement.

plural of thinking-cap

Alternative form of thinking cap

Forming one's own opinions; having independent judgment.

(idiomatic) Something that has gone extinct or become obsolete.

Synonym of new political thinking

(politics, historical) The doctrine put forth by Mikhail Gorbachev as part of his reforms of the Soviet Union. Its major elements were international collaboration, priority of universal human interests over the interests of any class, and mutual security based on political rather than military instruments.

(informal)

Having the ability to think or react quickly.