Essential character

(Biol.) the prominent characteristics which serve to distinguish one genus, species, etc., from another.

See also: Essential

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
Now the head, the hand, and such things are substances, and it is possible to know their essential character definitely, but it does not necessarily follow that we should know that to which they are related.
Your very ideas are but the outgrowth of the conditions of your bourgeois production and bourgeois property, just as your jurisprudence is but the will of your class made into a law for all, a will, whose essential character and direction are determined by the economical conditions of existence of your class.
And yet, majestic as the voice sometimes became, there was for ever in it an essential character of plaintiveness.
We are least likely in the modifications of these organs to mistake a merely adaptive for an essential character.' So with plants, how remarkable it is that the organs of vegetation, on which their whole life depends, are of little signification, excepting in the first main divisions; whereas the organs of reproduction, with their product the seed, are of paramount importance!
Of course, in actual fact, human learning is rendered easier, though psychologically more complex, through language; but at bottom language does not alter the essential character of learning, or of the part played by instinct in promoting learning.
This year, however, I and other yeshiva leaders are facing an additional and significant challenge, an attempt by New York State to impose a rigid set of rules that would alter the essential character of private schools, parochial and independent alike, where parents and educators work together to instill their values and strengthen their communities.
Sloan continues Wydick's concise, practical guide to clear legal writing, retaining the essential character of earlier editions while making some changes to address writing challenges that lawyers and law students face today.
A healthy relationship will keep your essential character intact.
If the Cathedral is rebuilt all that would change and perhaps the essential character and fascination would be lost.
If the Cathedral is rebuilt, all that would change and perhaps the essential character and fascination would be lost.
Gallardo is the 'El Padrino' (the godfather) to Mexican officials, and the 'Rockefeller of Marijuana' to US agents, but there is another essential character in the series that brings continuity to the story: Joaquin Guzman.
More specifically the Muslim Brotherhood is devoted to a political and religious project that in principle, in its essential character and goals, is hostile to other forms of politics, including our own.

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