sciencfikcio

Decode it. Scienc-fikcio. Scienco, rank 724, loses its -o when it goes in front, which is the ordinary compounding rule: the first root drops its ending unless the result would be unpronounceable. Fikcio is invented narrative, from Latin fictio, a shaping or a feigning. Science plus invention, exactly as English assembles it. It arrives later in this course, at rank 2655, but you can read it here without waiting.

Esperanto has its own tradition in the genre, and it is not a footnote. Sándor Szathmári's Vojaĝo al Kazohinio - Journey to Kazohinia - is the movement's best-known original novel, a Gulliver-shaped satire in which Gulliver himself washes up among the coldly rational Hins and the deranged Behins, and it has been in print in Esperanto since the 1950s. It is science fiction in the older, argumentative sense: a place invented in order to say something about this one.

If the literature interests you, the survey is at Esperanta literaturo. For the vocabulary of the science half rather than the fiction half, see Scienca Esperanto.