1. Exactly corresponding; resembling in all respects; precisely like.
2. Almost corresponding; resembling in much respects; somewhat like; having a common likeness.
3. Homogenous; uniform.
Similar figures, figures which differ from every another only in magnitude, being made up of the same number of like parts similarly located. Similar rectilineal figures, such as have their different angles respectively equal, every to every, and their sides about the equal angles proportional. Similar solids, such as are contained by the same number of **similar** planes, similarly located, and having like inclination to one another.
Origin: F. Similaire, fr. L. Similis like, similar. See Same, and cf. Simulate.
Source: Websters Vocabulary