In Spanish, almost all nouns have grammatical gender: masculine or feminine. That gender is part of the word and affects the elements that accompany it, such as Definite Articles, Indefinite Articles and adjectives, as seen in Adjective Agreement. Grammatical gender does not always coincide with biological sex: la persona is feminine even though speaking of a man, and el personaje is masculine even though speaking of a woman. By contrast, in many names of people and animals, gender can relate to sex, but the grammar remains the one in charge.

The ending usually gives a useful hint. Many nouns ending in -o are masculine: el libro, el patio, el vaso. Many nouns ending in -a are feminine: la mesa, la ventana, la casa. There are also very common words that follow this pattern, such as el amigo and la amiga. Still, the ending does not always determine gender: la mano ends in -o and is feminine, while el día ends in -a and is masculine. It is worthwhile to use the ending as a guide, not as an absolute rule.

Most common hint in final vowel

Idea
Many nouns ending in o are masculine.
Many nouns ending in a are feminine.
The ending helps, but does not guarantee gender in all cases.

Some endings reliably indicate gender quite often. Nouns ending in -ción, -sión, -dad, -tad, -tud, -umbre and -ie are usually feminine: la canción, la televisión, la ciudad, la libertad, la juventud, la costumbre, la especie. Among the masculine forms, endings like -aje, -ambre, -or, -ma, -án, -ín, -ón, -és and -ambre appear very frequently: el viaje, el hambre, el color, el problema, el capitán, el jardín, el buzón, el francés. Some of these forms come from Latin and keep that fixed gender even if the ending doesn’t look obvious.

Common gender endings

Idea
Many nouns ending in ción are feminine.
Many nouns ending in dad are feminine.
Many nouns ending in ma are masculine.
Many nouns ending in or are masculine.
Many nouns ending in e can be of any gender.

Nouns of people can change form to mark masculine and feminine. In variable nouns, one form ends in -o and the other in -a: niño / niña, médico / médica, profesor / profesora. There are also irregular changes: actor / actriz, emperador / emperatriz. In common nouns, the form does not change and the article or the adjective indicate the sex: el estudiante / la estudiante, el artista / la artista, el testigo / la testigo. This difference is useful together with Adjective Agreement, because the same stem can appear with different determiners.

Forms of nouns referring to people

Usage	Explanation
Variable noun	Used when the noun changes form to mark masculine and feminine.
Common noun	Used when the noun keeps the same form and the article marks the gender.
Reference to professions	Used to talk about jobs without repeating a different form for each sex.
Name of a person	Used when gender is understood from the article or from another nearby word.

The gender of the noun appears in the article and in the adjectives that accompany it. One says el coche rojo and la casa roja; un cuaderno nuevo and una mesa nueva. The article agrees in gender and number with the noun, and the adjective does as well. That is why the gender change of the noun pulls changes in the entire nominal expression. This agreement is clearly seen with Definite Articles and Indefinite Articles, which help to mark whether the noun is masculine or feminine.

Agreement with nouns

Usage	Explanation
Definite article	Used so that the article agrees in gender with the noun.
Agreeing adjective	Used so that the adjective follows the gender of the noun.
Masculine noun	The masculine form is used when the noun is masculine.
Feminine noun	The feminine form is used when the noun is feminine.

Some nouns do not follow the expected ending and it is worth learning them with their article. El mapa, el problema, el idioma, el clima, el tema are masculine even though they end in -a. La mano, la radio, la foto, la moto, la cama are feminine even though they do not end in a typical feminine form. There are also fixed-gender words like el día and la gente. In irregular cases, the form of the noun does not reliably reveal its gender, so the article is the most reliable signal.

el díael mapala manola radioel problemala manola clasela fotoel temael sofá

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Significa aparato o medio de comunicaciónSignifica dibujo que muestra un lugarSignifica imagen tomada o impresaSignifica grupo de alumnos o lecciónSignifica parte del cuerpo que usamos para agarrar cosasSignifica extremidad del brazoSignifica mueble para sentarse o tumbarseSignifica parte del tiempo entre amanecer y nocheSignifica asunto del que se hablaSignifica situación difícil o incómoda

Irregular nouns to memorize

Word	Definition
el día	Means part of the time between dawn and night.
la mano	Means part of the body we use to grab things.
la foto	Means image taken or printed.
el mapa	Means drawing that shows a place.
la radio	Means device or means of communication.
el problema	Means difficult or awkward situation.
el tema	Means subject of discussion.
la clase	Means group of students or lesson.
el sofá	Means furniture to sit or lie down.
la mano	Means extremity of the arm.

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When a feminine noun begins with a stressed a, the article changes to avoid a clash of sounds. You say el agua, el alma, el hacha, el águila, but the noun remains feminine. Therefore, feminine agreement is maintained in the rest: el agua fría, un alma buena, esta agua. In plural, the change disappears: las aguas, las almas, las hachas. The form of the article depends on the initial sound, not on the real gender of the word.

Article with stressed initial a

Idea
With feminine nouns beginning with a stressed a, use el in singular to avoid clash of sounds.
In plural, those nouns revert to the normal feminine article.
The adjective remains feminine even if the article changes.

When moving to the plural, the gender does not change. Only the number changes. El libro becomes los libros and la casa becomes las casas. The plural preserves the gender that the singular had, so the article and the adjectives follow that same category: unos zapatos negros, unas flores blancas. Even when the word ends in a vowel or a consonant, the gender remains the same. The plural adds quantity, it does not change the grammatical identity of the noun.

Gender agreement in plural

Idea
The gender of the noun does not change when going to plural.
Only number changes, not the class of gender.
The article and adjectives must also agree in plural.

In professions, positions and jobs, the feminine form can vary depending on the region and usage habits. Many feminine forms are well established: la doctora, la arquitecta, la jefa, la directora. Others are used differently depending on the country or context: la presidenta and la juez or la jueza can alternate, though the general tendency favors marked feminine forms when they exist and are common. When a profession name ends in a common form, the article and the rest of the expression mark the gender: la periodista, la gerente, la piloto. Agreement remains the key, just as with Definite Articles and Adjective Agreement.

la abogadala presidentala médicala ingeniera

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Se usa para marcar el femenino de profesiones con más naturalidad en muchos contextosSe usa para hacer visible el femenino de ciertos cargos en el habla cotidianaSe usa para nombrar el cargo en femenino cuando se quiere resaltar la forma femeninaSe usa para referirse a una profesional mujer con concordancia femenina clara

Regional variation in titles and occupations

Region	Variant	Definition	Example
Spain	la médica	Used to mark feminine of professions more naturally in many contexts.	la médica llegó con una sonrisa y un maletín verde.the medical doctor arrived with a smile and a green briefcase.
Mexico	la ingeniera	Used to name the position in feminine when you want to emphasize the feminine form.	la ingeniera presentó un puente hecho de galletas.the engineer presented a bridge made of cookies.
Argentina	la presidenta	Used to make visible the feminine of certain positions in everyday speech.	la presidenta saludó a una fila de pingüinos.the president greeted a line of penguins.
Colombia	la abogada	Used to refer to a female professional with clear feminine agreement.	la abogada defendió al loro con mucha elegancia.the lawyer defended the parrot with much elegance.

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