el impulsor
-the driving force
See the entry for impulsor.

impulsor

impulsor, el impulsor, la impulsora(
eem
-
pool
-
sohr
)
An adjective is a word that describes a noun (e.g., the big dog).
adjective
a. driving
¿Cuál fue la fuerza impulsora que generó la reacción química?What was the driving force that triggered the chemical reaction?
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).
masculine or feminine noun
a. driving force
El partido ecologista fue el impulsor detrás de la ley que prohíbe las bolsas de plástico.The green party was the driving force behind the law banning plastic bags.
a. promoter
La universidad ahora tiene baños unisex. El profesor Mustacchio fue el principal impulsor del cambio.The university has now unisex bathrooms. Professor Mustacchio was the main promoter of the change.
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