1.Adjectivesuperlative form of far: most far
Most distant in time, space or degree.
"The furthest known galaxy is about 13 billion light years from Earth."
2.AdjectiveMost distant in time, space or degree.
"The furthest known galaxy is about 13 billion light years from Earth."
3.Adverbsuperlative form of far: most far
To, at or over the greatest distance in space, time or other extent.
"Of all the children in our school, I can run furthest.; He lives furthest from the office, so his commute is the longest.; This civilisation was the furthest advanced."
4.AdverbTo, at or over the greatest distance in space, time or other extent.
"Of all the children in our school, I can run furthest.; He lives furthest from the office, so his commute is the longest."