What is a Jupiter antradasha?!

What is a Jupiter antradasha?

This was given to me by a Vedic astrologer. What does this mean?

An antradasha is a sub period of a planet. Within Vedic Astrology there are many systems of prediction (forecasting) based on the Moons Nakshastra position at birth that recur in a fixed cycle of time that is different for each planet. For each main period, Dasha, there is a sub period called a bhukti, or antradasha.
Though various types of conditional planetary periods for specific combinations in a nativity are mentioned in the classical texts, Vimsottari dasa system has been mentioned for general applications. Based on the longitude of the Moon in the natal charts, the balance of operational Vimsottari dasa is calculated. Thereafter, the planets have their main periods in order the Sun followed by the Moon, Mars, Rahu, Jupiter, Saturn, Mercury, Ketu and Venus.

During the major period of each planet all other planets share periods proportionate to their period in the Vimsottari dasa. This share of the period is known as sub-period (bhukti) and the first sub-period in any planet’s own main period is always its own, followed by other planets in the order mentioned above.

So, your Jupiter antradasha is just the time period when the influences of Jupiter and the combinations it is involved in your birth chart are operating. We would have to analyze your birth chart to give you a meaning.