letter

n.

1. A unit of the alphabet

   character, digraph, diphthong, capital, cap*, upper case, lower case, LC*, l.c.*, small letter, majuscule.*, minuscule.*, rune.*, uncial.*, alphabet.*, logotype.*, ligature; see also consonant, vowel.

   The Greek letters are: alpha, beta, gamma, delta, epsilon, zeta, eta, theta, iota, kappa, lambda, mu, nu, xi, omicron, pi, rho, sigma, tau, upsilon, phi, chi, psi, omega.

2. A written communication

   note, epistle, missive, message, billet*, memorandum*, report*, line*; see also word 3.

   Types of letters include: business, form, circular, drop, open, chain, cover, fan, love, personal; letter of credit, letter of resignation, billet-doux, postcard, postal, direct mail advertising, junk mail*.

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