自

Astronomy

rotation period

Xinjiang Uyghur Autonomous Region (China)

nature observation

independently developed; proprietary

free; unfettered; according to one's own whims; doing as one likes

Movement for Civic Rights and Freedom (Meiji era); Freedom and People's Rights Movement

natural childbirth

voluntary recall (e.g. of faulty goods)

freethinker

private airplane; private jet

free-for-all; open-to-all

optional (to participate in); non-compulsory

charcoal-burning suicide

free thought

electric bicycle; e-bike

self-improvement book

boasting of one's hometown

Buddhism

Avalokiteshvara (Bodhisattva); Avalokitesvara; Kannon; Kwannon; Guanyin; Buddhist deity of compassion

natural tendency; natural course of events; force of circumstances

self-employed person

(something that is) available for use at any time; (someone who is) at one's beck and call; (something over which) one has complete mastery

self-centeredness; self-centredness; selfishness; egotism; egoism

Computing

auto-answer; automatic answering

fire engine; fire truck

Physics

free electron