LATIN DICTIONARYLexicon Latīnum
verbirregular conjugation, suppletive, impersonal, no passive, no supine stem except in the future active participle, no gerund

est ubi

est ubi (present infinitive esse ubi, perfect active fuit ubi, future active participle futūrus ubi)
Classical[ˈɛst ˈʊ.bɪ]Ecclesiastical[ˈɛst ˈuː.bi]

Meaning

  1. idiomaticimpersonalsuppletiveone day, sometime; once, there was a time when
    Simo: Erit ubi tē ulcīscar, sī vīvō.Simo: I'll get my revenge sometime, as true as I live. Pseudolus: Why threaten? I have a back (i.e. "flog me if you like").the play Pseudolus by T. Maccius Plautus (the text may be read here)
  2. idiomaticimpersonalsuppletivesometimes

Conjugation future irregular no supine

active indicative
formpresentimperfectfutureperfectpluperfectfut. perfect
1st sg.——————
2nd sg.——————
3rd sg.est ubierat ubierit ubifuit ubifuerat ubifuerit ubi
1st pl.——————
2nd pl.——————
3rd pl.——————
active subjunctive
active subjunctive
formpresentimperfectperfectpluperfect
1st sg.————
2nd sg.————
3rd sg.sit ubi
siet ubi, fuat ubi
esset ubi
foret ubi
fuerit ubifuisset ubi
1st pl.————
2nd pl.————
3rd pl.————
imperative
imperative
formactivepassive
fut. 3rd sg.estō ubi—
infinitives & participles
infinitives & participles
formactivepassive
present infinitiveesse ubi—
perfect infinitivefuisse ubi—
future infinitivefutūrum esse ubi
fore ubi
—
future participlefutūrus ubi—

Origins

From est (“there is”) + ubi (“when, where”) referring to "time, opportunity".

Quick answers

What does est ubi mean in Latin?
est ubi, a verb, means “one day, sometime; once, there was a time when; sometimes”.
What are the principal parts of est ubi?
est ubi, esse ubi, fuit ubi, futūrus ubi (irregular conjugation, suppletive, impersonal, no passive, no supine stem except in the future active participle, no gerund).
How do you pronounce est ubi?
In classical Latin, [ˈɛst ˈʊ.bɪ]; in ecclesiastical (church) Latin, [ˈɛst ˈuː.bi].