In Jainism, the word “Kalp / Kalpa” is used in several related meanings. Common ones are:

1. Kalp = Proper conduct / method / rule

- Meaning: “niyam”, “vidhi”, “paddhati” – a set of rules or method of right conduct. - Example: Kalpa-sutra – a scripture about rules and conduct (especially for monks and Paryushan).

1. Kalp = Time-period / cosmic age

- Used in Jain cosmology as a large unit of time or cosmic cycle.

1. Kalp = Heavenly realm

- In Jain texts, “Kalp” also means a group of heavens (e.g. Saudharma, Ishana, etc. – Kalpa heavens where certain devas reside).

1. Kalp-vṛiksha (Kalp tree)

- A wish‑fulfilling tree mentioned in Jain cosmology in the early phases of the world-cycle.

In short:

• Everyday Jain usage (like Kalpasutra) – Kalp = conduct / rules / procedure.
• Cosmology – Kalp = a very long time-period and also a class of heavenly worlds.