Quick answer
"Frontier" is a noun which is often translated as "la frontera", and "borderline" is a noun which is also often translated as "la frontera". Learn more about the difference between "frontier" and "borderline" below.
frontier
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
1. (border)
a. la frontera
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
I will not go with you on your trip across the frontier, because I don't have a valid passport.No te voy a acompañar en el viaje tras la frontera, porque no tengo un pasaporte válido.
2. (historical)
Regionalism used in the United States
(United States)
a. la frontera del oeste
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
My great-great-grandparents traveled to the frontier in a covered wagon in 1880.Mis tatarabuelos viajaron a la frontera del oeste en un carromato en 1880.
3.
A phrase used as a figure of speech or a word that is symbolic in meaning; metaphorical (e.g. carrot, bean).
(figurative)
(knowledge limit)
a. la frontera
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
Laurie became an astronaut so she could have a career at the frontiers of human knowledge.Laurie se hizo astronauta para tener una carrera en las fronteras del conocimiento humano.
b. el límite
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
Dave is doing research on the frontiers of physics.Dave está haciendo investigaciones sobre los límites de la física.
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borderline(
bawr
-
duhr
-
layn
)
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
1. (boundary)
a. la frontera
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
Because of a conflict between the two countries, we're not allowed to cross the borderline.Por un conflicto entre los dos países, no se permite cruzar la frontera.
b. la línea divisoria
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
You have to pay a toll every time you cross the borderline between these two areas.Tienes que pagar un peaje cada vez que cruzas la línea divisoria entre estas dos áreas.
c. el límite
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(between categories)
She was neither a liberal nor a conservative but was somewhere on the borderline.No era ni liberal ni conservadora sino que estaba en algún punto en el límite entre los dos.
An adjective is a word that describes a noun (e.g. the big dog).
2. (debatable)
a. dudoso
The doctors couldn't agree if the patient truly had depression or if he was a borderline case.Los doctores no pudieron ponerse de acuerdo acerca de si el paciente tenía depresión o si era un caso dudoso.
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