One that arouses awe, astonishment, surprise, or admiration; a marvel: "The decision of one age or country is a wonder to another\u201d ( John Stuart Mill). The emotion aroused by something awe-inspiring, astounding, or marvelous: gazed with wonder at the northern lights. An event inexplicable by the laws of nature; a miracle. A feeling of puzzlement or doubt. A monumental human creation regarded with awe, especially one of seven monuments of the ancient world that appeared on various lists of late antiquity. To have a feeling of awe or admiration; marvel: "She wondered at all the things civilization can teach a woman to endure\u201d ( Frances Newman). To have a feeling of surprise. To be filled with curiosity or doubt. To feel curiosity or be in doubt about: wondered what happened. Arousing awe or admiration. Wonderful. Far superior to anything formerly recognized or foreseen. for a wonder As a cause for surprise; surprisingly.