Au"to*type (&?;), n. [Auto- + - type: cf. F. autotype.] 1. A facsimile.
2. A photographic picture produced in sensitized pigmented gelatin by exposure to light under a negative; and subsequent washing out of the soluble parts; a kind of picture in ink from a gelatin plate.
Au`to*ty*pog"ra*phy (&?;), n. [Auto- + typography.] A process resembling "nature printing," by which drawings executed on gelatin are impressed into a soft metal plate, from which the printing is done as from copperplate.
Au*tot"y*py (&?;), n. The art or process of making autotypes.
Au"tumn (&?;), n. [L. auctumnus, autumnus, perh. fr. a root av to satisfy one's self: cf. F. automne. See Avarice.] 1. The third season of the year, or the season between summer and winter, often called "the fall." Astronomically, it begins in the northern temperate zone at the autumnal equinox, about September 23, and ends at the winter solstice, about December 23; but in popular language, autumn, in America, comprises September, October, and November.
In England, according to Johnson, autumn popularly comprises August, September, and October. In the southern hemisphere, the autumn corresponds to our spring.