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But the term "identical twins" has a specific meaning. It refers to twins resulting from the fertilization of a single ovum by a single sperm cell, which ovum then splits in uterus. This is different from "fraternal twins," which refers to two ova fertilized at the same time and developing simultaneously. Identical twins will have identical DNA; fraternal twins will not. (And identical twins must always be the same gender, whereas fraternal twins may be of different genders).
Beyond that, "identical" means what the dictionary says it means, unless a law using the term defines it differently in the law itself.
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