Twin/twɪn/ Definition 1 of 3Pro Tip 1/3Twin Types Twins can be 'identical' (looking the same) or 'fraternal' (different in appearance). Are your twins identical or fraternal? Pro Tip 2/3Twin Dynamic Twins may have a special connection but aren't always similar in personality. Though twins, they have distinct tastes in music. Pro Tip 3/3Cultural Beliefs In some cultures, twins are considered auspicious or hold special significance. In our village, the birth of twins is celebrated with a big feast.