phylogeny

As a noun phylogeny

is (systematics) the evolutionary history of groups of organisms, such as species or clades.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between phylogeny and classification

is that phylogeny is (systematics) the evolutionary history of groups of organisms, such as species or clades while classification is the act of forming into a class or classes; a distribution into groups, as classes, orders, families, etc, according to some common relations or attributes.

In systematics terms the difference between phylogeny and cladistics

is that phylogeny is the evolutionary history of groups of organisms, such as species or clades while cladistics is an approach to biological systematics in which organisms are grouped based upon synapomorphies (shared derived characteristics) only, and not upon symplesiomorphies (shared ancestral characteristics).

As nouns the difference between phylogeny and systematics

is that phylogeny is the evolutionary history of groups of organisms, such as species or clades while systematics is the science of systematic classification, especially of organisms. Depending on context this may be the same as taxonomy or distinct. In the latter case systematics will be taken to mean the research into the relationships of organisms, while taxonomy will involve itself in the recognition and the naming of taxa.

As nouns the difference between ontology and phylogeny

is that ontology is the branch of metaphysics that addresses the nature or essential characteristics of being and of things that exist; the study of being qua being while phylogeny is the evolutionary history of groups of organisms, such as species or clades.

As a noun phylogeny

is (systematics) the evolutionary history of groups of organisms, such as species or clades.

As an adverb phylogenetically is

based on phylogenetics.

As nouns the difference between phylum and phylogeny

is that phylum is a rank in the classification of organisms, below kingdom and above class; also called a division, especially in describing plants; a taxon at that rank while phylogeny is the evolutionary history of groups of organisms, such as species or clades.

As nouns the difference between hylogeny and phylogeny

is that hylogeny is an alternative spelling of hylogenesis while phylogeny is the evolutionary history of groups of organisms, such as species or clades.

As nouns the difference between phylogeny and cladogram

is that phylogeny is the evolutionary history of groups of organisms, such as species or clades while cladogram is a branching treelike graphical representation of the phylogenetic relationships between organisms showing which taxa have branched from common ancestors.