Having a resemblance in appearance or nature; alike though not identical.
Having corresponding angles equal and corresponding line segments proportional. Used of geometric figures.
Nearly but not exactly the same or alike; having a resemblance.
Having the same shape, but not the same size or position.
The definition of similar is two things that have characteristics that resemble each other but are not exactly alike.
An example of similar is a cream skirt and a white skirt.
(mathematics) Of geometrical figures including triangles, squares, ellipses, arcs and more complex figures, having the same shape but possibly different size, rotational orientation, and position; in particular, having corresponding angles equal and corresponding line segments proportional; such that one can be had from the other using a sequence of operations of rotation, translation and scaling.
That which is similar to, or resembles, something else, as in quality, form, etc.