Thesaurus Linguae Latinae

The Thesaurus Linguae Latinae (abbreviated as ThLL or TLL) is a monumental dictionary of Latin founded on historical principles.

The project was founded in 1894 by Eduard Wölfflin and the first fascicle was published in 1900.

[1] At the time, the researchers thought it would take up to 20 years to complete the thesaurus.

[1] The offices of the TLL contain copies of all surviving Latin texts from 600 CE and earlier.

[1] The stacks contain boxes that collectively contain about 10 million slips on which is "every surviving piece of writing from the classical period", sorted into usage categories by word.