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01
un, una
used when we want to talk about a person or thing for the first time or when other people may not know who or what they are
Ejemplos
She wants to be a doctor when she grows up.
Ella quiere ser un médico cuando sea mayor.
1.1
un, una
used before a noun when we are not talking about a specific person or thing
Ejemplos
She received a letter from a friend.
Ella recibió una carta de un amigo.
02
un, una
used to show someone or something belongs to a group or type
Ejemplos
She is using a computer to complete the task.
Ella está usando una computadora para completar la tarea.
01
la nota la, el la
the musical pitch A, which is a specific note in the diatonic scale commonly used in Western music
información gramatical
estado de animacidad
inanimado
composición morfológica
simple
contable
forma plural
A's
propio
02
ångström, unidad de longitud igual a una diez mil millonésima parte de un metro
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
03
un, el grupo sanguíneo A
the blood group whose red cells carry the A antigen
04
la primera letra del alfabeto romano, la letra A
the 1st letter of the Roman alphabet
05
adenina, uno de los cuatro nucleótidos utilizados en la construcción del ADN
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
06
adenina, base púrica encontrada en el ADN y ARN
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
