arithmetically

adverb2

1. •
   In terms of arithmetic.

   • The two terms are arithmetically equivalent, but they are not equally intuitive regarding what phenomenon they represent in the real world.
2. •
   In a way characterized by addition (of increments) rather than multiplication (by factors) or exponentiation (by exponents): by an arithmetic progression.

   • Over the past decade the business has grown arithmetically, which shows that it is serving a demand successfully; but because it has not grown exponentially, its growth is viewed by some investors as "not good enough."