Quick answer
"O" is a noun which is often translated as "la o", and "either" is a conjunction which is often translated as "o". Learn more about the difference between "o" and "either" below.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
1. (letter)
a. la o
(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).
The name "Olivia" starts with an o.El nombre "Olivia" empieza con una o.
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A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
1. (indicating two options)
a. o
Either close the door or come inside.O cierra la puerta o entra.
b. u (before a word beginning with "o/ho")
It'll take either hours or mere minutes.Se tardará u horas o unos minutos.
An adjective is a word that describes a noun (e.g. the big dog).
2. (one or another)
a. cualquiera
You can choose either glass.Puedes escoger cualquiera de los dos vasos.
b. ninguno (with a negated verb)
I don't think either team will win.No creo que gane ninguno de los dos equipos.
3. (both)
a. ambos
There was a person on either side of me on the plane.Tenía a una persona a ambos lados de mí en el avión.
b. cada
There were beautiful ferns on either side of the country lane.Había unos helechos hermosos a cada lado del sendero rural.
A pronoun is a word that stands in for a noun (e.g. she).
4. (one or another)
a. cualquiera
I like both of those popsicle flavors, so I can eat either.Me gustan las paletas de ambos sabores, así que puedo comerme cualquiera.
b. ninguno (with a negated verb)
I don't like beef or chicken sandwiches. I don't want either.No me gustan los sándwiches ni de carne ni de pollo. No quiero ninguno.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
5. (as well)
a. tampoco (with a negated verb)
I don't like cockroaches either.No me gustan las cucarachas tampoco.
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