A (EN)

letter, noun, symbol

letter “A”

1. the first letter of the Latin alphabet
   Mellen Iech un, fir d'Iwwersetzungen vun den Beispillsätz an d'monolingual Definitioune vun all Wuert ze gesinn.

   Alice began her alphabet lesson by writing an A on the whiteboard.

noun “A”

1. the top grade in school, showing excellent work
   After studying all night, she earned As in all her subjects.

symbol “A”

1. the first note in the A minor scale (also the standard pitch for tuning, vibrating at 440 Hz)
   When tuning her violin, Maria always starts by adjusting the A string to match the 440 Hz pitch.
2. a blood type with a specific antigen
   If you have blood type A, you cannot donate blood to someone with type B because of the different antigens.
3. the total number of protons and neutrons in an atom's nucleus
   In the nucleus of an atom, A represents the total number of protons and neutrons combined.
4. a type of battery slightly bigger than AA size
   The flashlight requires A batteries, which are harder to find than the more common AA size.
5. the smallest standard size for the cup of a bra
   She realized she had been wearing the wrong bra size and needed to switch to an A cup.
6. the symbol for area in geometry
   To find the total space inside the square, we need to calculate its area using the formula A = side × side.
7. a type of driver's license for motorcycles
   To ride that, you need to obtain an A category license.
8. ampere (the unit for measuring electrical current)
   The electrician measured the current of the circuit and found it to be exactly 10 A.
9. in genetics, it is the abbreviation for adenine
   In the DNA sequence A T C G, "A" stands for adenine.
10. in biochemistry, the symbol for alanine in proteins
    In the protein sequence GAVLI, "A" stands for alanine.
11. alto, the voice range below soprano
    In the choir, she was assigned to sing the A part because of her rich alto voice.
12. vehicle-distinguishing sign for Austria
    On the back of the car, there was an "A" sticker indicating it was from Austria.