The Collaborative International Dictionary of English v.0.48:

Philosophy \Phi*los"o*phy\ (f[i^]*l[o^]s"[-o]*f[y^]), n.; pl.
   Philosophies (f[i^]*l[o^]s"[-o]*f[i^]z). [OE. philosophie,
   F. philosophie, L. philosophia, from Gr. filosofi`a. See
   Philosopher.]
   1. Literally, the love of, inducing the search after, wisdom;
      in actual usage, the knowledge of phenomena as explained
      by, and resolved into, causes and reasons, powers and
      laws.
      [1913 Webster]

   Note: When applied to any particular department of knowledge,
         philosophy denotes the general laws or principles under
         which all the subordinate phenomena or facts relating
         to that subject are comprehended. Thus philosophy, when
         applied to God and the divine government, is called
         theology; when applied to material objects, it is
         called physics; when it treats of man, it is called
         anthropology and psychology, with which are connected
         logic and ethics; when it treats of the necessary
         conceptions and relations by which philosophy is
         possible, it is called metaphysics.
         [1913 Webster]

   Note: "Philosophy has been defined: -- the science of things
         divine and human, and the causes in which they are
         contained; -- the science of effects by their causes;
         -- the science of sufficient reasons; -- the science of
         things possible, inasmuch as they are possible; -- the
         science of things evidently deduced from first
         principles; -- the science of truths sensible and
         abstract; -- the application of reason to its
         legitimate objects; -- the science of the relations of
         all knowledge to the necessary ends of human reason; --
         the science of the original form of the ego, or mental
         self; -- the science of science; -- the science of the
         absolute; -- the science of the absolute indifference
         of the ideal and real." --Sir W. Hamilton.
         [1913 Webster]

   2. A particular philosophical system or theory; the
      hypothesis by which particular phenomena are explained.
      [1913 Webster]

            [Books] of Aristotle and his philosophie. --Chaucer.
      [1913 Webster]

            We shall in vain interpret their words by the
            notions of our philosophy and the doctrines in our
            school.                               --Locke.
      [1913 Webster]

   3. Practical wisdom; calmness of temper and judgment;
      equanimity; fortitude; stoicism; as, to meet misfortune
      with philosophy.
      [1913 Webster]

            Then had he spent all his philosophy. --Chaucer.
      [1913 Webster]

   4. Reasoning; argumentation.
      [1913 Webster]

            Of good and evil much they argued then, . . .
            Vain wisdom all, and false philosophy. --Milton.
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   5. The course of sciences read in the schools. --Johnson.
      [1913 Webster]

   6. A treatise on philosophy.
      [1913 Webster]

   Philosophy of the Academy, that of Plato, who taught his
      disciples in a grove in Athens called the Academy.

   Philosophy of the Garden, that of Epicurus, who taught in a
      garden in Athens.

   Philosophy of the Lyceum, that of Aristotle, the founder of
      the Peripatetic school, who delivered his lectures in the
      Lyceum at Athens.

   Philosophy of the Porch, that of Zeno and the Stoics; -- so
      called because Zeno of Citium and his successors taught in
      the porch of the Poicile, a great hall in Athens.
      [1913 Webster]

WordNet (r) 3.0 (2006):

philosophy
    n 1: a belief (or system of beliefs) accepted as authoritative
         by some group or school [syn: doctrine, philosophy,
         philosophical system, school of thought, ism]
    2: the rational investigation of questions about existence and
       knowledge and ethics
    3: any personal belief about how to live or how to deal with a
       situation; "self-indulgence was his only philosophy"; "my
       father's philosophy of child-rearing was to let mother do it"

Moby Thesaurus II by Grady Ward, 1.0:

220 Moby Thesaurus words for "philosophy":
   Aristotelianism, Berkeleianism, Bradleianism,
   Buddha-like composure, Cynicism, Cyrenaic hedonism, Cyrenaicism,
   Epicureanism, Fichteanism, Hegelianism, Heideggerianism,
   Heracliteanism, Herbartianism, Humism, Kantianism, Leibnizianism,
   Marxism, Mimamsa, Neo-Hegelianism, Neo-Pythagoreanism,
   Neoplatonism, Newtonian physics, Oriental calm, Peripateticism,
   Platonism, Purva Mimamsa, Pyrrhonism, Pythagoreanism, Sankhya,
   Schellingism, Scotism, Socratism, Sophism, Sophistry,
   Spencerianism, Stoicism, Thomism, Weltanschauung, acosmism,
   acoustics, aerophysics, aesthetics, agnosticism, animalism,
   animatism, animism, aplomb, applied physics, astrophysics, atomism,
   attitude, basic conductor physics, biophysics, body of ideas,
   calm disposition, calm of mind, calmness, chemical physics,
   composure, control, cool, coolheadedness, coolness, cosmotheism,
   countenance, criticism, cryogenics, crystallography, cytophysics,
   deduction, deductive reasoning, deism, demonstration,
   dialectical materialism, discourse, discourse of reason,
   discursive reason, dispassion, dualism, easy mind, eclecticism,
   egoism, electron physics, electronics, electrophysics, empiricism,
   epistemology, equanimity, ethics, ethos, eudaemonism,
   existentialism, feeling, geophysics, hedonism, humanism,
   hylomorphism, hylotheism, hylozoism, icy calm, idea, idealism,
   ideology, immaterialism, imperturbability, imperturbation,
   indisturbance, individualism, induction, inductive reasoning,
   intuitionism, logic, logical thought, macrophysics, materialism,
   mathematical physics, mechanics, mechanism, medicophysics,
   mental composure, mentalism, metaphysics, microphysics, monism,
   mysticism, natural philosophy, natural science, naturalism,
   neocriticism, nominalism, notion, nuclear physics, ontologism,
   ontology, opinion, optics, optimism, organic mechanism, organicism,
   outlook, panpsychism, pantheism, patience, peace of mind,
   peacefulness, pessimism, philosophic composure, philosophicalness,
   physic, physical chemistry, physical science, physicalism,
   physicism, physicochemistry, physicomathematics, physics,
   placidity, pluralism, point of view, positivism, pragmaticism,
   pragmatism, proof, psychism, psychological hedonism, psychophysics,
   quiet, quiet mind, quietude, radiation physics, radionics,
   ratiocination, rationalism, rationality, rationalization,
   rationalizing, realism, reason, reasonableness, reasoning,
   resignation, restraint, sang-froid, sangfroid, secular humanism,
   self-control, self-possession, semiotic, semiotics, sensationalism,
   sentiment, serenity, skepticism, solar physics,
   solid-state physics, soothingness, sophistry, specious reasoning,
   statics, stereophysics, stoicism, substantialism, sweet reason,
   syncretism, system of ideas, system of theories, tenets, theism,
   theoretical physics, thermodynamics, thinking, thoughtfulness,
   tranquillity, transcendentalism, unruffledness, utilitarianism,
   viewpoint, voluntarism, world view, zoophysics



The Free On-line Dictionary of Computing (30 December 2018):

philosophy

   See computer ethics, liar paradox, netiquette, proof.


The Devil's Dictionary (1881-1906):

PHILOSOPHY, n.  A route of many roads leading from nowhere to nothing.