wan (Adjective) — (of light) lacking in intensity or brightness; dim or feeble. ex. "the wan stars"
wan (Adjective) — Abnormally deficient in colour as suggesting physical or emotional distress. ex. "her wan face suddenly flushed"
wan (Adjective) — Lacking vitality as from weariness, illness or unhappiness. ex. "a wan smile"
wan (Noun) — A computer network that spans a wider area than does a local area network.
wan (Verb) — Become pale and sickly.