1. The next after the sixteenth.

2. The ordinal of seventeen; one of seventeen equal parts.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sevententh,
• seventheenth,
• seventeeno,
• seventeeth,
• seveneenth,
• sevenenth,
• aeventeenth,
• zeventeenth,
• xeventeenth,
• deventeenth,
• eeventeenth,
• weventeenth,
• seveenteenth,
• seveenteeth,
• seveententh,
• sevienteenth,
• sevienteeth,
• sevinteenth,
• sevintheenth,
• sevintienth

• seventy-two,
• seventy-eight,
• seventies,
• seventy-four,
• seventy-seven,
• seventy-fifth,
• seventhly,
• seventy-five,
• seventeen,
• seventy-six,
• seventh heaven,
• Seventh Avenue,
• seventieth,
• seventy-nine,
• seventh chord,
• seventy-three,
• seventy-one.

The adjective form of the word "seventeenth" is "seventeenth".

The plural form of the word "seventeenth" is "seventeenths".

The singular form of the word "seventeenth" is "seventeen"