speso means an obsolete unit of Esperanto international currency. Lexicurio rates it Sui generis — a strength score of 100 out of 100.
noun
- An obsolete unit of Esperanto international currency.“Thus—1 moso=1000 spesoj. The connection between the values of these theoretical and the national coins is as follows:— / 10 mosoj) are equal to 8 or 10,000 spesoj of grammes of gold.”