What is the meaning of -ad?

a unit or set (especially of a specified number)

your (second-person singular informal, single possession)

Added to a stem to form a verb.

Suffix in names of settlements.

Used to form past participle form of many weak verbs

suffix forming verbal nouns

suffix forming the third-person singular imperative form

suffix forming the third-person singular imperfect indicative form

suffix forming the third-person singular past subjunctive form

suffix forming the third-person singular conditional form of reduplicated and ē-future stems

suffix forming the singular passive conjunct preterite form of s-preterite stems

Plural (3 or more) pronoun marker.

Suffix appended to words to create a feminine noun, usually a collective noun.

used to form the informal second-person plural imperative mood of -ar verbs

-ed, used to form adjectives from nouns, in the sense of having the object represented by the noun.

suffix forming past participle

show the action of a verb or its result

suffix indicating an agent noun: -er, -or

person who comes from somewhere or is classed by something, -ian, -ist

-ate, suffix denoting one of a group of related compounds - nitrad (“nitrate”), sylffad (“sulfate”).

Source: wiktionary.org

See also