observans
Observans is a Latin present active participle form meaning “observing” or “watching.” In general Latin usage, it functions as an adjective describing someone who observes, notes, or keeps to rules, and it can also be used substantively to refer to a person who observes.
Etymology and grammar: Observans comes from the verb observare, formed with the present participle suffix -ans.
Religious usage: In medieval and early modern Catholic contexts, Observans (often capitalized or rendered as Observants
Modern usage: In English, observant describes someone who is attentive to rules or to what is observed.
See also: Observance, Observant, Observantism, Franciscan Observants.