1. (n.) A sweetheart chosen on St. Valentine's Day.

2. (n.) A letter containing professions of love, or a missive of a sentimental, comic, or burlesque character, sent on St. Valentine's Day.

Pastoral Epistle aerogram air letter airgraph bull chain letter dead letter dimissorial dimissory letter drop letter encyclical fan letter form letter letter of credit letter of introduction letters credential letters of marque letters of request letters overt letters patent letters rogatory love letter mash note monitory newsletter nixie open letter pastoral letter poison-pen letter round robin valentine