ἀδιάφορα: indifferent things, neither good nor bad.
ἀγαθός: good, proper object of desire.
ἄνθρωπος: human being, used by Epictetus to express an ethical ideal.
ἀπάθεια: serenity, peace of mind, such as that achieved by the Stoic sage.
ἀφορμή: aversion, impulse not to act (as a result of ekklisis). Opposite of hormê.
ἀπροηγμένα: dispreferred things. Morally indifferent but naturally undesirable things, such as illness. Opposite of proêgmena.
ἀρετή: Virtue. Goodness and human excellence.
ἄσκησις: disciplined training designed to achieve virtue.
ἀταραξία: tranquillity, untroubled by external things.
αὐτάρκεια: self-sufficiency, mental independence of all things.
δαίμων: divine spirit within humans.
διαίρεσις: analysis, division into parts. Used when distinguishing what is subject to our power of choice from what is not.
δικαιοσυνε: justice, "consonant with the law and instrumental to a sense of duty" (Diogenes Laertius 7.98). One of the four virtues (justice, courage, temperance, wisdom/prudence).
δόγμα: principle established by reason and experience.
δόξα: belief, opinion.
ἔκκλισις: aversion, inclination away from a thing. Opposite of orexis.
ἐκπύρωσις: cyclical conflagration of the Universe.
ἐφ' ἡμῖν: up to us, what is in our power, i.e. the correct use of impressions.
ἐπιστήμη: certain and true knowledge, over and above that of katalêpsis.
εὐδαιμονία: happiness, well-being.
εὐπάθεια: good feeling (as contrasted with pathos), occurring in the Stoic sage who performs correct (virtuous) judgements and actions.
ἡγεμονικόν: ruling faculty of the mind.
εἱμαρμένη: fate, destiny.
ὁρμή: positive impulse or appetite towards an object (as a result of orexis). Opposite of aphormê.
ὕλη: matter, material.
κάλος: beautiful. Sometimes used in a moral sense: honourable, virtuous.
κατάληψις: clear comprehension and conviction.
καθῆκον: duty, appropriate action on the path to Virtue.
κόσμος: order, world, universe.
λόγος: reason, explanation, word. Also, the ordering principle in the kosmos.
λόγος σπερματικός: the generative principle of the Universe which creates and takes back all things.
νόμος: law, custom.
οἴησις: opinion, usually arrogant or self-conceited.
οἰκείωσις: self-ownership and extension. The process of self-awareness in all animals, which in humans leads to a sense of community.
ὄρεξις: desire, inclination towards a thing, Opposite of ekklisis.
οὐσία: substance, being.
παιδεία: training, education.
παλιγγενεσία: periodic renewal of the world associated with ekpyrôsis.
πάθος: passion or emotion, often excessive and based on false judgements.
φαντασία: impression, appearance, the way in which something is perceived.
πνεῦμα: air, breath, spirit, often as a principle in Stoic physics.
προηγμένα: preferred things. Morally indifferent but naturally desirable things, such as health. Opposite of aproêgmena.
προαίρεσις: free will, reasoned choice, giving or withholding assent to impressions.
προκοπή: progress, on the path towards wisdom.
πρόληψις: preconception possessed by all rational beings.
ψυχή: mind, soul, life, living principle.
σοφός: wise person, virtuous sage, and the ethical ideal.
synkatathesis (or sunkatathesis)
συγκατάθεσις: assent, approval to impressions, enabling action to take place.
συμπάθεια: sympathy, affinity of parts to the organic whole, mutual interdependence.
τέχνη: craft, art. The practical application of knowledge, especially epistêmê.
τέλος: goal or objective of life.
θεώρημα: general principle or perception.
θεός: god; associated with the order in the Universe.
τόνος: tension, a principle in Stoic physics causing attraction and repulsion, and also the cause of virtue and vice in the soul.