thesis
thesis (tesis)
the one-sentence main claim of an essay, which the rest of the essay explains and supports.
Example
The author who supports the four-day week makes the stronger case because she uses data from real companies. (A clear thesis for a GED essay.)
In Spanish
thesis (tesis) — la afirmación principal de un ensayo, en una oración, que el resto del ensayo explica y apoya.
The author who supports the four-day week makes the stronger case because she uses data from real companies. (Una tesis clara: dice qué posición está mejor fundamentada y por qué.)