What does ecology mean?
Ecology is the branch of biology that studies how living organisms interact with each other and with their physical surroundings. It examines patterns such as energy flow, nutrient cycling, population dynamics, and the distribution of species across habitats. Beyond its strict scientific sense, the word is also applied figuratively to describe the interconnected workings of non-biological systems — for example, the ecology of a newsroom or of social media. Coined in the nineteenth century by the German zoologist Ernst Haeckel, the term derives from the Greek 'oikos', meaning house or dwelling, reflecting the idea of nature as an integrated home for life. Ecology carries connotations of balance, interdependence, and fragility, and it has become central to public debates about conservation, climate change, and sustainability. As both a rigorous academic discipline and a widely understood cultural concept, it remains one of the most important terms in modern discussions about humanity's place in the natural world.
nounThe branch of biology that deals with the relationships of living organisms to one another and to their physical surroundings. More broadly, the study of or concern with the interaction of people, institutions, or things within a system.
- The branch of biology concerned with the interactions between organisms and their environment.
- The interrelationships and dynamics of any complex system, often used metaphorically (e.g. political ecology, media ecology).
"Her research in ecology examines how pollinators shape entire ecosystems."
"Wetland ecology reveals how even small changes in water levels can reshape entire food webs."
"Understanding the ecology of misinformation requires studying how false ideas spread through online communities."
Rarely pluralised; used mainly in academic writing to refer to distinct systems of ecological relationships in different places or domains.
"The book compares the freshwater ecologies of three river basins."
The word 'ecology' was coined by German zoologist Ernst Haeckel in 1866 — and it shares its Greek root 'oikos' (house) with the word 'economy', making both fields, quite literally, the study of household management.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ecology
The word ecology derives from the Greek 'oikos' meaning house or dwelling, combined with '-logy', meaning study. It was coined in 1866 by the German zoologist Ernst Haeckel, drawing on earlier usage by Henry David Thoreau in a looser sense. The same root gives us 'economics', which originally meant household management — a shared origin that highlights how both disciplines concern themselves with managing resources within a system. Cognates include ecosystem, ecological, and related terms formed from the same Greek root.
Related word forms
How ecology is actually used
Ecology is primarily used as an uncountable noun referring to the scientific field. When used countably (as in 'the ecology of a coral reef'), it denotes the particular set of relationships characterising that system. In informal usage, it is sometimes conflated with environmentalism, though the two are distinct.
Easily confused with ecology
Ecology is the scientific study of organisms and their environment, whereas environmentalism is an ideology and social movement advocating protection of the natural world.
The environment refers to the physical surroundings themselves; ecology is the scientific discipline that studies them.