A relation.
Reciprocal exchange of civilities, especially conversation between persons by means of letters.
Postal or other written communications.
An agreement of situations or objects with an expected outcome.
Newspaper or news stories.
A similarity between physical and spiritual things (e.g. light to wisdom, or warmth to love)
A word whose meaning is the same as that of another word.
An alternative (often shorter) name defined for an object in a database.
Any name for a taxon, usually a validly published, formally accepted one, but often also an unpublished name.
A word or phrase with a meaning that is the same as, or very similar to, another word or phrase.
Any of the formal names for a taxon, including the valid name (i.e. the senior synonym).