回归 (huí guī) literally combines 回 (huí, 'to return, to go back') and 归 (guī, 'to return, to belong to, to go home'), creating a formal or literary verb meaning 'to return' — especially to a former state, place, condition, or role. It often implies restoration, reversion, or coming back after absence, separation, or change. Unlike the simpler 回 (huí) or 回来 (huí lái), 回归 carries weight and gravity: it’s used for historical returns (e.g., Hong Kong’s 1997回归 to China), scientific reversion (e.g., data回归 to baseline), or personal renewal (e.g.,回归初心 — 'returning to one’s original intention').

The word is common in formal writing, news reports, political discourse, and academic contexts. It rarely appears in casual daily speech — native speakers usually say 回来 or 回 instead. Note that 回归 is intransitive by default but can take a directional object with 的 or to (e.g., 回归祖国, 'return to the motherland'); it does not take direct objects like a transitive verb would.