musing(n = noun.cognition) contemplation, reflection, reflexion, rumination, thoughtfulness - a calm, lengthy, intent consideration;
is a kind of consideration
has particulars: cogitation, study, meditation, speculation, meditation, introspection, self-contemplation, self-examination, retrospect
Derived form verb muse₁

   musing(s = adj.all) brooding, broody, contemplative, meditative, pensive, pondering, reflective, ruminative - deeply or seriously thoughtful; "Byron lives on not only in his poetry, but also in his creation of the 'Byronic hero' - the persona of a brooding melancholy young man"

   Thinking long and intensely. [WordNet 1.5]

N  thought, exercitation of the intellect, exercise of the intellect, intellection, reflection, cogitation, consideration, meditation, study, lucubration, speculation, deliberation, pondering, head work, brain work, cerebration, deep reflection, close study, application, abstract thought, abstraction contemplation, musing, brown study, reverie, Platonism, depth of thought, workings of the mind, thoughts, inmost thoughts, self-counsel self-communing, self- consultation, philosophy of the Absolute, philosophy of the Academy, philosophy of the Garden, philosophy of the lyceum, philosophy of the Porch, association of thought, succession of thought, flow of thought, train of thought, current of thought, association of ideas, succession of ideas, flow of ideas, train of ideas, current of ideas, after thought, mature thought, reconsideration, second thoughts, retrospection, excogitation, examination, invention, thoughtfulness, thinking, thoughtful, pensive, meditative, reflective, museful, wistful, contemplative, speculative, deliberative, studious, sedate, introspective, Platonic, philosophical, lost in thought, deep musing, in the mind, under consideration, all things considered, the mind being on the stretch, the mind turning upon, the head turning upon, the mind running upon, divinely, bent to meditation, en toute chose il faut considerer la fin, fresh- pluckt from bowers of never-failing thought, go speed the stars of Thought, in maiden meditation fancy-free, so sweet is zealous contemplation, the power of thought is the magic of the Mind, those that think must govern those that toil, thought is parent of the deed, thoughts in attitudes imperious, thoughts that breathe and words that burn, vivere est cogitare, Volk der Dichter und Denker.