statistiko

The gift is hiding in plain sight: it is state-science. Statistiko and ŝtato at rank 1,075 are the same Latin word, status, arriving by two different roads. Gottfried Achenwall coined Statistik in Germany in 1749 for a specific thing: the systematic collection of facts a ruler needs about his own country - how many people, how much grain, how many men of fighting age. For its first century the subject had nothing to do with probability and everything to do with counting a state's contents. The mathematics arrived later and took the name with it. Every time you say statistiko you are saying ŝtato, which is a much better fact than most etymologies give you.

Singular and plural, and the trap English sets. English uses "statistics" for both the discipline (which takes a singular verb) and the individual figures (which take a plural), and native speakers get it wrong constantly. Esperanto separates them cleanly with the endings it already has: la statistiko is the subject or a body of figures taken as one, and la statistikoj are several separate sets of figures. Statistika is the adjective, statistikisto a statistician, and statistike means statistically. No irregularity, no argument.

Where it sits in the course. The counting vocabulary is now assembled: nombro at 576 is a number, kalkuli at 817 is to calculate, procento at 1,995 is a percentage, and mezuri at 1,376 is to measure. Statistiko is what you do with all four at once. It belongs to the same borrowed international layer as ekologio and orbito in this band, and the scientific Esperanto article covers how that layer behaves: whole roots, no cutting, and an -ik- ending that marks a field of applied knowledge in matematiko, fiziko, tekniko and logiko too.