Answer

In Jain practice, these words refer to traditional time-period measurements used especially in the context of Pachchakkhān / Pratyākhyān — taking a vow of renunciation for a fixed duration.

• Porsi — a vow period lasting approximately one-fourth of the day.
• Sādh Porsi — a vow period lasting approximately one and a half Porsi.
• Purimaddh / Parimaddh — a vow period lasting approximately half of the day.
• Avaddh — a vow period lasting approximately three-fourths of the day.

Explanation

These are commonly used when a person takes a Pachchakkhān such as abstaining from food, water, or certain activities for a specific time.

A simple way to understand them:

• Porsi = about 1/4 of the daytime
• Sādh Porsi = about 3/8 of the daytime
• Purimaddh / Parimaddh = about 1/2 of the daytime
• Avaddh = about 3/4 of the daytime

The exact clock time can vary because Jain time calculations are traditionally connected with sunrise and sunset, not fixed modern clock hours.

Spiritual Understanding

These time-based vows help a person practice:

• Self-control
• Discipline over food and desires
• Awareness of time
• Gradual progress in tapasya

They are especially important because Jain Dharma teaches that even limited renunciation, done with right understanding and sincerity, purifies the soul.

Takeaway

Porsi, Sādh Porsi, Purimaddh/Parimaddh, and Avaddh are Jain vow-duration terms used to observe restraint for increasing portions of the day, helping the practitioner grow in tapas, discipline, and spiritual awareness.