spec. Biology. Conversion or transformation of one species into another; spec. applied to the form of evolution or development propounded by Lamarck…

Biology. The assumption by one organ of the function of another; the replacement of one organ or structure by another, esp. in the course of…

The distinguishing, identification, or naming of subspecies. Now chiefly Biology.

Biology (chiefly Botany). Evolutionary change in the form of an organ. Also (Botany): change of one type of organ into another as an abnormal…

The development of a plant from an embryo.

= phytogenesis, n.

= anamorphism, n. 2.

Biology. Mutual relation of association between different structures, characteristics, etc. in an animal or plant; ‘the normal coincidence of one…

Originally: †the evolutionary tendency of a species to develop characteristics similar to those of another species (obsolete rare). In later use…

Biology. The tendency in diverse or allied animals or plants to assume similar characteristics under like conditions of environment.

= phylogenesis, n. Also: the pattern of historical relationships between species or other groups resulting from divergence during evolution.

The origin and development of the individual organism; ontogenesis.

Biology. Originally: the (supposed) occurrence during the embryonic development of an individual organism of successive stages resembling adult…

The development of the individual organism from the earliest embryonic stage to maturity. Also: the development of a particular (anatomical…

The evolutionary development of a species or other group of organisms through a succession of forms. Also: the evolutionary development of a…

The history of the origin and evolution of living organisms; spec. = recapitulation, n.1 1c. Cf. biogeny, n. 2. Now chiefly historical.

The original evolution of life or living organisms from inorganic or inanimate substances; archebiosis; = biogenesis, n. 1b. Also more widely: the…

Progressive or ‘upward’ evolution of species (opp. catagenesis, n.).

acceleration in development by the shortening or suppression of intervening stages.

Evolutionary change proceeding consistently in one direction, esp. as supposedly produced by a tendency to accumulate similar mutations in…

the evolutionary diversification of an animal or plant lineage into a number of forms adapted to different habitats or ecological niches; an…

The formation of new and distinct species in the course of evolution.

Evolutionary change on a small scale or over a relatively short time period; spec. that resulting from small mutations within a species.

Biology. The existence, or evolutionary development of, a subspecies or of subspecies. Also: a pattern of variation within a population suggestive of…

The evolutionary development of distinguishable biological races (race, n.6 5).

A theory which proposes a cause other than natural selection for consistent trends in the direction of evolution (orthogenesis).

An evolutionary increase in the complexity or relative size of the brain; a shift of function from non-cortical parts of the brain to the cortex.

The appearance in the early stages of an organism's life of features characteristic of adult forms of its evolutionary descendants.

Allometric relationships, esp. the change in these between members of different phylogenetic groups.

A process of adaptive evolution that leads to the development of a greater variety of animals or plants.

Used attributively or in the possessive to designate concepts originated by Wallace or related to his… the evolution of reproductive isolation…

Zoology. A sequence of evolutionary change in mammalian coat colour, consisting of loss of agouti patterning and reduction in pigmentation.

Biology. Rapid or sudden evolutionary change, esp. speciation, as suggested by the theory of punctuated equilibrium (see punctuated, adj. 3); an…

pertaining to or resulting from speciation (esp. in speciational evolution).

the sudden appearance of an organ in evolution; the part so appearing (Webster Suppl. 1902).