四

love-sickness

April fool

four-letter word (esp. in English)

vocal quartet; four-part chorus

sleep four hours and pass, sleep five hours and fail (when cramming for university entrance exams)

Buddhism

the four stages of existence: birth, life, death, and limbo

Linguistics

yodan verb conjugation; verb conjugation of classical Japanese

four-armed scoop net

Yokkaichi asthma

Medicine

quadriplegia; tetraplegia

Calamansi (Citrus x microcarpa)

Buddhism

four realms (in Tendai Buddhism or Yogacara)

four ordinal directions

しい only; From Guanzi

four cardinal principles of the state (propriety, justice, integrity, sense of shame)

Chamisso's lousewort (Pedicularis chamissonis var. japonica)

28th day after death

four orders of Buddhist followers (monks, nuns, male lay devotees and female lay devotees)

four monastic communities (ordained monks, ordained nuns, male novices and female novices)

In Tendai

the four assemblies

quatrain

Sumo

four tassels hung above the ring

Buddhism

satipatthana; mindfulness

finger millet (Eleusine coracana)

Four Classic Novels of Chinese literature (Romance of the Three Kingdoms, Journey to the West, Water Margin, and The Plum in the Golden Vase)

Sumo

wrestling in which both wrestlers grasp the other's belt with both hands

Music

tetrad

matched set of four arrows for target shooting