n. using the technical language of ecology to make the user seem ecologically aware. [ WordNet 1.5 ]

adj. of or pertaining to ecology; as, an ecological disaster.
Syn. -- bionomic, bionomical. [ WordNet 1.5 ]

n. a biologist who studies the relation between organisms and their environment. [ WordNet 1.5 ]

n. [ Gr. o'i^kos house + -logy. ] (Biol.) the branch of biology concerned with the various relations of animals and plants to one another and to their surrounding environment. [ PJC ]

adj. of or pertaining to econometrics; as, econometric theories. [ WordNet 1.5 ]

n. an economist who uses statistical and mathematical methods. [ WordNet 1.5 ]

n. the application of mathematics and statistics to the study of economic and financial data. [ WordNet 1.5 ]

{ } a. [ F. économique, L. oeconomicus orderly, methodical, Gr. &unr_; economical. See Economy. ] 1. Pertaining to the household; domestic. “In this economical misfortune [ of ill-assorted matrimony. ]” Milton. [ 1913 Webster ]

2. Relating to domestic economy, or to the management of household affairs. [ 1913 Webster ]

And doth employ her economic art
And busy care, her household to preserve. Sir J. Davies. [ 1913 Webster ]

3. Managing with frugality; guarding against waste or unnecessary expense; careful and frugal in management and in expenditure; -- said of character or habits. [ 1913 Webster ]

Just rich enough, with economic care,
To save a pittance. Harte. [ 1913 Webster ]

4. Managed with frugality; not marked with waste or extravagance; using the minimum of time or effort or resources required for effectiveness; frugal; -- said of acts; saving; as, an economical use of money or of time; an economic use of home heating oil. [ wns=3 ] [ 1913 Webster + WordNet 1.5 ]

5. of or pertaining to the national or regional economy; relating to political economy; relating to the means of living, or the resources and wealth of a country; relating to the production or consumption of goods and services of a nation or region; as, economic growth; economic purposes; economical truths; an economic downturn. [ 1913 Webster ]

These matters economical and political. J. C. Shairp. [ 1913 Webster ]

There was no economical distress in England to prompt the enterprises of colonization. Palfrey. [ 1913 Webster ]

Economic questions, such as money, usury, taxes, lands, and the employment of the people. H. C. Baird. [ 1913 Webster ]

6. Regulative; relating to the adaptation of means to an end. Grew. [ 1913 Webster ]

7. of or pertaining to economics. economic theory [ WordNet 1.5 ]

8. profitable. Opposite of uneconomic. [ wns=4 ] [ WordNet 1.5 +PJC ]

9. avoiding waste; as, an economical meal. Opposite of wasteful.
Syn. -- frugal, scotch, sparing, stinting, thrifty. [ WordNet 1.5 ]

☞ Economical is the usual form when meaning frugal, saving; economic is the form commonly used when meaning pertaining to the management of a household, or of public affairs. [ 1913 Webster ]

adv. With economy; with careful management; with prudence in expenditure. [ 1913 Webster ]

n. [ Gr. ta` o'ikonomika`, equiv. to "h o'ikonomi`a. See Economic.] 1. The science of household affairs, or of domestic management. [1913 Webster]

2. Political economy; the science of the utilities or the useful application of wealth or material resources; the study of the production, distribution, and consumption of goods and services of a nation or region, and its effect on the wealth of a country. See Political economy, under Political. “In politics and economics.” V. Knox. [1913 Webster +PJC]