Dharma may be described as a religious path. It encompasses the idea of a universal and a personal principle which is is a lodestar for Hindus, Zoroastrians, Buddhists, Jains and Sikhs. According to Vedic scripture, dharma means truth:

Dharma is truth.
It is said that one who speaks truth speaks dharma
and one who speaks dharma speaks truth.

Bhridaranyaka Upanishad I.4.14

see On Hinduism, Chapter Eight, Darma