1828 dictionary Noah Webster's 1828 American Dictionary 1828 webster
Noah Webster's 1828 American Dictionary
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A  ›  aplanatic
A  ›  aplanatic
1828 Definition

APLANAT'IC, a. [Gr. to wander.]

An aplanatic telescope is one which entirely corrects the aberration of the rays of light. It is thus distinguished from the achromatic, which only partially corrects the aberration.
1913 Definition
Aplanatic (aplanatic)
a.((?))
Ap`la*nat"ic
[Gr. 'a priv. + (?) disposed to wander, wandering, (?) to wander.] (Opt.)
  1. Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens.

    Aplanatic focus of a lens (Opt.), the point or focus from which rays diverging pass the lens without spherical aberration. In certain forms of lenses there are two such foci; and it is by taking advantage of this fact that the best aplanatic object glasses of microscopes are constructed.


1828 dictionary
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God's Word, contained in the Bible, has furnished all necessary rules to direct our conduct.
  




Innovation is a key driver of entrepreneurial activity. Innovation from an entrepreneurial perspective is conceptually defined using the complementary views of Austrian economists Kirzner and Schumpeter. Incremental innovation is defined as entrepreneurial activity from Kirzner's perspective -- exploitation of awareness of market disequilibrium which appropriates value: market-sensing, customer-linking. Radical innovation is defined as entrepreneurial activity from Schumpeter's perspective -- exploration as a market-disequilibrium "creative destruction" which creates value: market-making, customer-driving. From a firm's perspective, innovation research in marketing addresses three fundamental questions: What is an innovation? What innovations are most valuable to a firm? How do innovations influence the competitive marketplace? From an entreprenuerial perspective, I address these fundamental questions.




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