LATIN DICTIONARYLexicon Latīnum
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“closeness” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

closeness
density of substance, etc., crassitudo: densitas (thickness): spissitas (closeness approaching to impenetrability).
Taciturnity, taciturnitas: pectus clausum.
Nearness, propinquitas: vicinia (neighborhood).
Closeness of an intimacy or connection, mostly by conjunctio with a proper adjective (magna, summa, tanta, quanta, etc.): he had often heard from me what a delightful closeness of intimacy there was between us, saepe ex me audierat, quam suavis esset inter nos et quanta conjunctio: this closeness of our intimacy, haec nostra conjunctio. The greatest possible closeness of intimacy, artissima (cum aliquo) summae conjunctionis vincula: to have a great closeness of intimacy with anybody, arte (artissime) cum aliquo conjungi.
Parsimony, parsimonia (in anything, alicujus rei): tenacitas (close-fistedness: *Liv., 34, 7, 4): malignitas (the niggardliness that withholds from others the full measure of what is due to them).
Of a room, the air, etc.: gravitas.
Cogency of an argument, auctoritas (Vid: Quint., 10, 1, 111), or by cincumlocution to use great closeness of argument, firma ad probandum argumenta afferre; gravissima et firmissima argumenta afferre.

Quick answer

What is the Latin word for closeness?
The usual Latin words for “closeness” are crassitūdō, dēnsitās, spissĭtas; also taciturnitās, propinquitās, vīcīnia. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.