The word "平稳" (píngwěn) is formed through the common Chinese morphological process of **compound formation**, where two independent, semantically related characters are combined to create a new, more specific meaning. The first character, "平" (píng), carries the core meaning of "level," "even," or "calm," while the second character, "稳" (wěn), means "steady," "stable," or "firm." When joined, their meanings complement and reinforce each other, producing the compound adjective "平稳," which describes a state of being smooth, stable, balanced, and free from turbulence or abrupt change, applicable to both physical motion (like a smooth ride) and abstract conditions (like a stable situation or steady prices).