English Dictionary

A

symbol

A rank, normally the highest rank, on any of various scales that assign letters. / (education) The highest letter grade assigned (disregarding plusses and minuses).

The letter 'A' is a symbol of a rank.

意味（1）

A rank, normally the highest rank, on any of various scales that assign letters.

We assign each item inspected a rating from A through G, depending on various factors.

意味（2）

(education) The highest letter grade assigned (disregarding plusses and minuses).

I was so happy to get an A on that test.

意味（3）

(music) A tone three fifths above C in the cycle of fifths; the sixth tone of the C major scale; the first note of the minor scale of A minor; the reference tone that occurs at exactly 440 Hz; the printed or written note A; the scale with A as its keynote.

Orchestras traditionally tune to a concert A.

意味（4）

(medicine) A blood type that has a specific antigen that aggravates the immune response in people with type B antigen in their blood. People with this blood type may receive blood from type A or type O but cannot receive blood from AB or B.

My blood type is A negative.

意味（5）

(chemistry) Mass number.

意味（6）

(logic) A universal affirmative suggestion.

意味（7）

(historical) Abbreviation of adulterer, adulteress, used as a human brand.

Hester Prynne, the historical character in The Scarlet Letter, was exposed and convicted by neighborhood gossip. … Gossip continues to brand some young ladies in small towns with this symbolic letter, but in our larger cities one rarely sees young ladies branded with an A.

意味（8）

Allele dominant.

意味（9）

(chiefly US) Alternative spelling of A.M. (“ante meridiem”) or AM