[OED:] 6. e. Characterized by continuous or natural development;
(Business) designating expansion generated by a company's own resources, as opposed to that resulting from the acquisition of other companies.
Neither Etymonline nor OED explain the etymology for this newer definition, whose first example sentence is dated 1923.
Please expose and explain all (hidden and missing) semantic drifts and links. What bridges the jumps with the original meaning?
From which older definition of 'organic' does this newer one derives? An organ may develop in size, but NOT in function as the definition above presupposes.
(eg: A bladder doesn't simply develop into a gallbladder).