What does triakonta mean in Greek?

But other fell into good ground, and brought forth fruit, some an hundredfold, some sixtyfold, some thirtyfold.

But he that received seed into the good ground is he that heareth the word, and understandeth it; which also beareth fruit, and bringeth forth, some an hundredfold, some sixty, some thirty.

And said unto them, What will ye give me, and I will deliver him unto you? And they covenanted with him for thirty pieces of silver.

Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders,

Then was fulfilled that which was spoken by Jeremy the prophet, saying, And they took the thirty pieces of silver, the price of him that was valued, whom they of the children of Israel did value;

And other fell on good ground, and did yield fruit that sprang up and increased; and brought forth, some thirty, and some sixty, and some an hundred.

And these are they which are sown on good ground; such as hear the word, and receive it, and bring forth fruit, some thirtyfold, some sixty, and some an hundred.

And Jesus himself began to be about thirty years of age, being(as was supposed) the son of Joseph, which was the son of Heli,

And a certain man was there, which had an infirmity thirty and eight years.

So when they had rowed about five and twenty or thirty furlongs, they see Jesus walking on the sea, and drawing nigh unto the ship: and they were afraid.