Sewage \Sew"age\, n.

1. The contents of a sewer or drain; refuse liquids or matter carried off by sewers

2. Sewerage, 2.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Sewerage \Sew"er*age\, n.

1. The construction of a sewer or sewers.

2. The system of sewers in a city, town, etc.; the general drainage of a city or town by means of sewers.

3. The material collected in, and discharged by, sewers. [In this sense sewage is preferable and common.]

Source: Webster's Revised Unabridged Dictionary (1913)