名詞 vocative:

1. the case (in some inflected languages) used when the referent of the noun is being addressed
   同義詞：vocative case

形容詞 vocative:

1. relating to a case used in some languages

voc.a.tive

adj.（形容詞）
Relating to, characteristic of, or used in calling.
稱呼的：關(guān)于或有稱呼特點(diǎn)的，或稱呼所用的
Abbr. voc.,v.Relating to or being a grammatical case used in Latin and certain other languages to indicate the person or thing being addressed.
縮寫 voc.,v.呼格的：關(guān)于或作為一種用于拉丁語和一些其它語言的語法情況，用于指示被稱呼的人或物
n.Abbr. voc.,v.（名詞）縮寫 voc.,v.
The vocative case.
呼格
A word in the vocative case.
呼格中的一個(gè)詞

來源：
Middle English vocatif
中古英語 vocatif
from Old French
源自 古法語
from Latin voc3tovus (c3sus) [vocative (case)]
源自 拉丁語 voc3tovus (c3sus) [稱呼（格）]
from voc3tus [past participle of] voc3re [to call] * see vocation
源自 voc3tus [] voc3re的過去分詞 [呼叫] *參見 vocation

【引伸】
voc.atively
adv.（副詞）