Answer

In Jain terminology used in Terapanth, Biyāsan means taking food twice a day, with each meal taken while sitting in one place. It is treated as a form of austerity and discipline. ( jainworld.jainworld.com)

Explanation

Biyāsan is stricter than ordinary eating because it limits both the number of meals and the way food is taken. Jain guides describe it as a practice of restraint, and some texts also note that during such observances, boiled water is used. ( jainworld.jainworld.com)

Spiritual Understanding

The purpose of Biyāsan is to reduce attachment to taste and comfort, and to strengthen self-control, simplicity, and renunciation. In Jain practice, such austerities help purify conduct and support spiritual progress. ( jainworld.jainworld.com)

Takeaway

Biyāsan = two meals a day, seated in one place, as a Jain vow of restraint. ( jainworld.jainworld.com)