: deliberate, purposeful, or disciplined mental activity : thought that fundamental brainwork without which no philosopher can get very far — Times Literary Supplement.

What is meant by the expression brainwork?

noun. work or effort consisting principally or largely of mental activity, thought, imagination, etc., as opposed to physical or manual work. the effort of thought, reasoning, planning, or the like; ordered or directed thinking: Solving problems is a form of brainwork.

Is brainwork a word?

The act or process of thinking: cerebration, cogitation, contemplation, deliberation, excogitation, meditation, reflection, rumination, speculation, thought.