(UK, dated, euphemistic) A condom.

An upper-case letter (A, B, C, ... as opposed to a, b, c, ...), used for emphasis, for starting sentences and proper names, etc.

(education) A letter of the alphabet assigned as an evaluation of schoolwork, with A generally being the best. Passing grades may also carry a plus or minus sign, with an A-minus (A-) better than B-plus (B+) and so on.

Synonym of moon letter

Synonym of sun letter

A power of attorney document.

(typography, uncountable) The distinction between majuscule (uppercase) and minuscule (lowercase) letters. / (countable) A case used for carrying written letters.

(calligraphy) A highly calligraphic Western European script style used from approximately 1150.

An explosive device sent through the post, triggered to explode when the letter or packet is opened. / (computing) A virus contained within an email or similar file.

A letter written about the author's love for the intended reader. / (figuratively) A work that shows great passion or enthusiasm for something.