vai

conjunction

1. used to indicate a disjunction between two elements; or (in the either-or sense, not in the sense of a.k.a., which is jeb).

   “atbildi: jā vai nē!”

2. used to suggest vagueness, uncertainty, or a veiled threat; usually followed by ellipsis (...); or, or else...

   “ja labi grib, to darbu var veikt parasts dežurants, vai brigadieris, vai (...)”

3. used to introduce conditional subordinate clauses; whether, if

   “nav zināms, vai to darījis viņš”

particle

1. interrogative particle, used in either-or questions

   “vai tu runā latviski?”

noun

1. the word vai itself; also, implicitly, a question

   “cits pēc cita nāca tik daudzi vai, ka viņa nevarēja ilgāk izturēt”

interjection

1. used to express emotional responses: excitement, surprise, pain, fear, sorrow, irritation, etc.

   “vai, ko es daru!”