微观 (wēi guān) literally combines 微 (wēi), meaning 'tiny' or 'minute', and 观 (guān), meaning 'to observe' or 'view'. Together, it describes something observable only at a very small scale — typically beyond the range of the naked eye — and is used broadly in science, economics, and social analysis. As an adjective, it modifies nouns to indicate a focus on minute details, individual units, or underlying structures rather than large-scale patterns.

The term is commonly contrasted with 宏观 (hóng guān, 'macroscopic' or 'macro-level'), especially in disciplines like biology (e.g., microscopic cell behavior), economics (e.g., individual consumer choices), and ecology (e.g., how a single insect interacts with its microhabitat). While it can function as a noun in technical contexts ('study the 微观'), its most frequent use is adjectival, as in 微观世界 (the microscopic world) or 微观分析 (micro-level analysis).