1) Theory of evolution 2) Theory of organic evolution 
Lamarckism (or Lamarckian inheritance) is the idea that an organism can pass on characteristics that it acquired during its lifetime to its offspring (also known as heritability of acquired characteristics or soft inheritance). It is named after the French biologist Jean-Baptiste Lamarck (1744–1829), who incorporated the action of soft inheritan...
The (obsolete) doctrine that acquired characters can be inherited.
A method of heredity that does not apply to genetics but is applicable to social adaptation. Lamarckism posits that acquired traits can be passed from parent to offspring. 
Lamarckism: The theory of acquired characteristics put forth by Jean-Baptiste P.A. Lamarck (1744-1829), a French botanist, zoologist and biological philosopher. According to Lamarck, evolution occurs because organisms can inherit traits acquired by their ancestors. Giraffes can only survive by eating leaves high up on trees so they stretch their ne...
Lamarckism is the theory of organic evolution proposed by Jean Lamarck, based on the principle that characteristics of an organism modified during its lifetime are inheritable.
[n] - a theory of organic evolution claiming that acquired characteristics are transmitted to offspring
an out-dated theory of how characteristics are passed to offspring. Now superseded by modern evolutionary thought and specifically Darwinism.
noun a theory of organic evolution claiming that acquired characteristics are transmitted to offspring