形容詞 virtual:

1. being actually such in almost every respect
   同義詞：practical
2. existing in essence or effect though not in actual fact

1. In a virtual storage system, a fixed-length block that has a virtual address and that is transferred as a unit between real storage and auxiliary storage.
   在虛擬存儲(chǔ)(器)系統(tǒng)中，具有一個(gè)虛擬地址并且可以在實(shí)存儲(chǔ)器和輔助存儲(chǔ)器之間作為一個(gè)單位來傳送的一種長(zhǎng)度固定的(數(shù)據(jù))塊。
2. For　example, in a Virtual space, Students can "dissect" a human body, "visit" ancient battlefields, or "talk" with Shakespeare, ...
   如，在虛擬的空間中，學(xué)生們可以“解剖”人體，“參觀”古戰(zhàn)場(chǎng)，與莎士比亞“對(duì)話”等等。
3. Our deputy manager is the virtual head of the business.
   我們的副經(jīng)理是公司的實(shí)際負(fù)責(zé)人。
4. A virtual state of war exists between the two countries.
   這兩國(guó)間實(shí)際上處于戰(zhàn)爭(zhēng)狀態(tài)。

vir.tu.al

adj.（形容詞）
Existing or resulting in essence or effect though not in actual fact, form, or name:
實(shí)質(zhì)上的，實(shí)際上的：雖然沒有實(shí)際的事實(shí)、形式或名義，但在實(shí)際上或效果上存在或產(chǎn)生的：
例句：
the virtual extinction of the buffalo.
野牛實(shí)際上已經(jīng)絕跡

Existing in the mind, especially as a product of the imagination. Used in literary criticism of text.
虛的，內(nèi)心的：在頭腦中存在的，尤指意想的產(chǎn)物。用于文學(xué)批評(píng)中

來源：
Middle English virtuall [effective]
中古英語(yǔ) virtuall [有效的]
from Medieval Latin virtu3lis
源自 中世紀(jì)拉丁語(yǔ) virtu3lis
from Latin virtôs [excellence] * see virtue
源自 拉丁語(yǔ) virtôs [優(yōu)秀] *參見 virtue

【引伸】
vir.tual.ity