Online Google Dictionary

arithmetician 中文解釋 wordnet sense Collocation Usage Collins Definition
  1. someone who specializes in arithmetic
  2. Arithmetic or arithmetics (from the Greek word ἀριθμός = number) is the oldest and most elementary branch of mathematics, used by almost everyone, for tasks ranging from simple day-to-day counting to advanced science and business calculations. ...
  3. One with expertise in arithmetic. A mathematician