Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class IV. Words Relating to the Intellectual Faculties
Division (I) Formation of Ideas
Section I. Operations of Intellect in General

451. Thought.

   NOUN:THOUGHT; exercitation -, exercise- of the intellect; intellection; reflection, cogitation, consideration, meditation, study, lucubration, speculation, deliberation, pondering; head work, brainwork; cerebration; mentation, deep reflection; close study, application (attention) [See Attention].
  association -, succession -, flow -, train -, current- of -thought, – ideas.
  MATURE THOUGHT; afterthought, reconsideration, second thoughts; retrospection (memory) [See Memory]; excogitation; examination (inquiry) [See Inquiry]; invention (imagination) [See Imagination].
  thoughtfulness &c. adj.
  ABSTRACTION, abstract thought, contemplation, musing; brown study (inattention) [See Inattention]; reverie or revery, depth of thought, workings of the mind, thoughts, inmost thoughts; self-counsel, self-communing, self-consultation.
  [PHILOSOPHY] philosophical -opinions, – systems, – schools; the handmaid of theology, ancilla theologiœ [L.].
  ORIENTAL PHILOSOPHY: Vedânta or Uttara-Mîmâmsâ [“later investigation”]; Pûrva-Mîmâmsâ [“prior investigation”]; Sâmkhya -, Yoga -, Nyâya -, Vaisheshika- philosophy.
  GREEK AND GRECO-ROMAN PHILOSOPHY: Ionian -, Pythagorean -, Eleatic- school; Atomism; Sophism or Sophistic philosophy.
  Socratic -, Megarian or Eristic -, Elean- school; Cynic philosophy; Cyrenaic or Hedonistic school, Hedonism; Platonism; philosophy of the -Absolute, -Academy; Aristotelianism, philosophy of the Lyceum; Peripatetic school [historical formula: concept, Idea, essence].
  Stoic philosophy, Stoicism, philosophy of the Porch; Epicureanism, philosophy of the Garden; Scepticism; Eclecticism.
  Neo-Pythagoreanism; Neo-Platonism.
  PATRISTIC PHILOSOPHY: Gnosticism, Manicheism; Alexandrian school; philosophy of the Ante-Nicene Fathers, philosophy of the Post-Nicene Fathers.
  SCHOLASTIC PHILOSOPHY: Scholasticism; Eclecticism; Mysticism, Mystic philosophy; Pantheistic school, pantheism; Thomism, Scotism, voluntarism; Averroism.
  MODERN PHILOSOPHY: Post-Reformation philosophy; Humanism, rationalism, political philosophy; Cartesianism; Spinozism; empiricism, moralism; idealistic philosophy, idealism; Leibnitzianism or Leibnizianism, Berkeleian philosophy, Berkeleyism; pan-phenomenalism.
  modern German philosophy: Kantianism, Fichteanism, Schelling’s philosophy, Hegelianism, Herbartianism, Schopenhauer’s philosophy; neocriticism; Freudianism, Freudian theory; Einstein theory, relativism.
  modern French philosophy: traditionalism; psychologico-spiritualistic school; Positivism; sociological school; Bergsonism.
  modern English philosophy: associational psychology, utilitarianism, Darwinism, evolutionistic ethics; Spencerian philosophy; agnosticism, idealism, Neo-Hegelianism.
  modern Italian philosophy: Vicoism, sensism, empiricism, criticism, idealism, ontologism, Neo-Scholasticism.
  American philosophy: Transcendentalism, pragmatism, neo-voluntarism, new ethical movement; Neo-Hegelianism, Neo-Hegelian movement.
   VERB:THINK, reflect, cogitate, excogitate, consider, reason, deliberate; bestow -thought, – consideration -upon; speculate, contemplate, meditate, ponder, muse, dream, ruminate; brood over, con over, study; mouse over [U. S.], mull over [colloq., U. S.], sweat over [colloq.]; bend -, apply- the mind (attend) [See Attention]; digest, discuss, hammer at, hammer out, weigh, perpend [archaic]; realize, appreciate; fancy (imagine) [See Imagination]; trow [archaic].
  rack -, ransack -, crack -, beat -, cudgel- one’s brains; set one’s -brain, – wits- to work; cerebrate, mentalize [rare].
  harbor -, entertain -, cherish -, nurture- an idea [See Idea], take into one’s head; bear in mind; reconsider.
  TAKE INTO CONSIDERATION; take counsel (be advised) [See Advice]; commune with oneself, bethink oneself; collect one’s thoughts; revolve -, turn over -, run over- in the mind; chew the cud upon [colloq.], sleep upon; take counsel of -, advise with- one’s pillow.
  SUGGEST itself, present itself, occur; come -, get- into one’s head; strike one, flit across the view, come uppermost, run in one’s head; enter -, pass in -, cross, -, flash on -, flash across -, float in -, fasten itself on -, be uppermost in -, occupy- the mind; have in one’s mind.
  MAKE AN IMPRESSION; sink -, penetrate- into the mind; engross the thoughts.
   ADJECTIVE:THOUGHTFUL, pensive, meditative, reflective, cogitative, excogitative, museful, wistful, contemplative, speculative, deliberative, studious, sedate, introspective, Platonic, philosophical; thinking &c. v.
  UNDER CONSIDERATION, in contemplation, under advisement.
  ABSORBED, rapt; lost in thought (inattentive) [See Inattention]; engrossed in (intent) [See Attention].
   ADVERB:all things considered, taking everything into -account, – consideration.
  1. The mind being on the stretch; the -mind, – head- -turning, – running- upon.
  2. Divinely bent to meditation.—Richard III
  3. En toute chose il faut considérer la fin.
  4. Fresh-plucket from bowers of never-failing thought.—O. Meredith
  5. Go speed the stars of Thought.—Emerson
  6. In maiden meditation fancy-free.—Midsummer Night’s Dream
  7. So sweet is zealous contemplation.—Richard III
  8. The power of Thought is the magic of the Mind.—Byron
  9. Those that think must govern those that toil.—Goldsmith
  10. Thought is parent of the deed.—Carlyle
  11. Thoughts in attitudes imperious.—Longfellow
  12. Thoughts that breathe and words that burn.—Gray
  13. Vivere est cogitare.—Cicero
  14. Volk der Dichter und Denker.
  15. Thinking is the function; living is the functionary.—Emerson