### Progression

**PROGRES'SION**, *noun* [Latin progressio, progredior.]

**1.** The act of moving forward; a proceeding in a course; motion onwards.

**2.** Intellectual advance; as the *progression* of thought.

**3.** Course; passage.

**4.** In mathematics, regular or proportional advance in increase or decrease of numbers; continued proportion, arithmetical or geometrical. Continued arithmetical proportion, is when the terms increase or decrease by equal differences. Thus,

**2.** 4. 6. 8. 10.

. 8. 6. 4. 2. by the difference 2.

Geometrical proportion or *progression* is when the terms increase or decrease by equal ratios. Thus,

**2.** 4. 8. 16. 32. 64.

64. 32. 16. 8. 4. 2. by a continual multiplication or division by 2.