Akademik
Wycl - zygo
Wyclif, John
Xanthippe
Xenocrates
Xenocrates of Chalcedon
Xenophanes of Colophon
Xenophon
yin and yang
yin/yang
Yoga
Yogacara
Zarathustra
Zen
Zeno
Zeno of Citium
Zeno of Elea
Zeno of Elea's
Zeno's
Zeno's paradox
Zeno's paradoxes
Zermelo–Fraenkel set theory
Zermelo–König paradox
zeugma
Zorn's lemma
Zoroastrianism
Zoroastrians