Any person who is on the path towards Buddhahood but has not yet attained it
An altar depicting Burmese Buddhist weizzas. In this esoteric tradition, weizzas consider themselves to be bodhisattvas.

But the fact is that both the Theravada and the Mahayana unanimously accept the Bodhisattva ideal as the highest...Although the Theravada holds that anybody can be a Bodhisattva, it does not stipulate or insist that all must be Bodhisattva which is considered not practical.

Bengali Sculpture of Manjushri, the bodhisattva of wisdom, 11th century
Statue of Guanyin's 'thousand arms' form, the arms symbolize all the skillful means employed by Guanyin to help sentient beings.