Where does “Roman square capitals” come from?

Roman square capitals (English) comes from English square, from Middle English square, from Old French esquarre, from Vulgar Latin exquadra, from Latin ex, from Latin commūnicō, from Latin commūnis, from Old Latin com(m)oinis — resin.

Roman square capitals (English): API pl; The form of writing used in ancient Rome...

Definitions

  1. API pl; The form of writing used in ancient Rome...

Ancestry of “Roman square capitals”, step by step

Roman square capitals traces back through 3 separate lines of ancestry.

via English square

StepLanguageWordMeaning
1EnglishsquareA polygon with four sides of equal length and...
2Middle EnglishsquareA square tool used to ensure a right angle
3Old Frenchesquarresquare
4Vulgar Latinexquadra
5LatinexA name of the letter "X"; out of, from
6Latincommūnicōto impart, share
7Latincommūniscommon, commonplace, ordinary, general, universal, shared, shared alike, of both sides, belonging to two or more together
8Old Latincom(m)oinis
9Proto-Italickommoiniscommon
10Proto-Indo-Europeanḱom-moy-ni-held in common
11Proto-Indo-Europeanḱómbeside, near, by, with
12Proto-Indo-EuropeanḱeDeictic particle, here; Post-positional...
13Middle Englishkyt
14Germankittputty certain kinds of cement used for fixing e.g. window panes
15Old High Germankuti
16Proto-West Germanickwidugum, resin
17Proto-Germanickweduzresin

via English capitals

StepLanguageWordMeaning
1Englishcapitalsplural of capital
2EnglishcapitalAlready-produced durable goods available for use...
3Frenchcapitalcapital money and wealth
4Latincapitālisof the head or life
5Latincaputhead; headlike protuberance on an organ or body...
6Proto-Italickaputhead
7Proto-Indo-Europeankáputhead
8Proto-Indo-Europeankap-to seize, hold

via English roman

StepLanguageWordMeaning
1Englishromanupright, as opposed to italic; of or related to...
2Old FrenchRomainRoman
3LatinRōmānusRoman
4Latin-ānusOf or pertaining to; -ian
Every word from Proto-Germanic kweduz