Tithe plainly means tenth. “The tenth part of agricultural produce or personal income set apart as an offering to God or for works of mercy, or the same amount regarded as an obligation or tax for the support of the church, priesthood…” – Dictionary definition.
Incidentally, Jesus was not recorded anywhere in the Bible to have paid tithes, neither did He collect tithes nor condemn tithing. Perhaps, the reason Jesus didn’t collect tithes was because he wasn’t a Levite. And maybe the reason he didn't condemn tithing was because he did not come to abolish the law of Moses - Matthew 5:17.
Then, why do the present day Pastors, who claim to be following the footsteps of Jesus and themselves not Levites, collect tithes?