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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
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
