A
- A. H. Armstrong
- Abel Jeannière
- adiaphoron
- aer
- Afrodite
- agathoeides
- agathon
- aggelos
- agnostos
- agrapha dogmata
- aidios
- aidos
- ainigma
- ainitettai
- aion
- airein
- aisthesis
- aisthesis koine
- aither
- aition
- Akhademeia
- akinetos
- akoe
- akrita
- Alain Boutot
- Alain de Libera
- aletheia
- Alexander Wilder
- Alexandre Costa
- Algis Uzdavinys
- allegoria
- alloiosis
- alma
- amor
- anabakkheuesthai
- anabasis
- analogia
- anamnesis
- ananke
- anaplerosis
- andreia
- Antelme-Édouard Chaignet
- Anthony Damiani
- anthropos
- antikeimenos
- Antonio Mesquita
- António Caeiro
- António Freire
- apatheia
- apeiron
- aphairesis
- Aphrodite
- aphtartos
- aphthartos
- apodeixis
- aponia
- apophasis
- aporia
- aporrhoai
- arche
- archon
- arete
- arithmos
- asebeia
- askesis
- asomata
- astrologia
- astron
- asymmetron
- athanatos
- Atlantis
- atomon
- Auguste Matinée
- autarkeia
- auto deixei
- automaton
- autos
- axioma
- Azcárate e outros