What is the meaning of -ai?

forms the first-person singular past historic indicative form of an -er verb

possessive suffix for multiple possessions:

  1. his, her, its ……-s (third-person singular; the pronoun ő (s/he) being optional for emphasis)

    his, her, its ……-s (third-person singular; the pronoun ő (s/he) being optional for emphasis)

    your ……-s (second-person singular, grammatically resembling the third person sg.)

    construed with a noun or certain pronouns as the possessor: ……’s ……-s, ……-s of …… (third-person sg. or pl., depending on the noun or pronoun)

    used with a stem to form the first-person singular past historic of -are verbs

    masculine plural of -aio

    forms the 2-person plural affirmative imperative of 1 conjugation verbs; appended to the stem

    Attached to a stem, forms the present infinitive of most regular verbs

    receiver or sufferer of action, -ee

    agentive suffix, -er

    instrument

    gas, -gen

    verb suffix for the third-person singular imperfect/conditional

    verb suffix for the third-person singular conditional

    Source: wiktionary.org