I.e. a change in DNA within a population.
If a population moved from a location with scant food resources to one with abundant food resources - and as a result attained a larger average size - that would not be an example of evolution. Unless there was also a corresponding change in the DNA of the population that would take place over several generations (i.e. the abundant resources favor certain alleles that are advantageous only when nutrition is not limited).
Chinese children raised eating an American diet grow taller than thier parents or Chinese raised cohorts. They didn't “evolve” to be taller - they just got taller through better nutrition.
That IS evolution by the plain meaning of the word.It may not be Darwinian Evolution)(notice the caps) or Punctuated Equilibrium Evolution, but it is evolution all the same. Evolution is change, temporary, contingent, or permanent, or slight, by implication not sudden or catastrophic. I do not surrender the language to the Left or to some clique of professors.