pirate

robber, thief, burglar, bandit, gangster, pirate

这些名词均有“资贼、强盗”之意。
robber: 指以暴力或威胁等手段强行夺取他人财物的人。
thief: 普通用词含义广泛，一般专指盗窍者。
burglar: 指夜间撬窗破门行窃的人。
bandit: 指在乡间或小林地区结帮活动，使用恐吓或暴力行窃的人。现指有组织或单独进行抢窃的盗匪。
gangster: 指结伙进行各种非法活动的武装歹徒。
pirate: 指海盗。

名词 pirate:

1. someone who uses another person's words or ideas as if they were his own
   同义词：plagiarist, plagiarizer, plagiariser, literary pirate
2. someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
   同义词：buccaneer, sea robber, sea rover
3. a ship that is manned by pirates
   同义词：pirate ship

动词 pirate:

1. copy illegally; of published material
2. take arbitrarily or by force
   同义词：commandeer, hijack, highjack

1. After a long battle the pirate captain struck his flag.
   久战之后，海盗船长降旗投降。
2. A swift pirate ship, often operating with official sanction.
   海盗船一种很快的海盗船，通常有官方允许
3. The design for the new dress collection is pirate in the far east.
   新式服装的系列设计在远东被非法翻印(剽窃)。
4. The sailor suddenly saw a pirate jumping onto the deck.
   那水手忽然看到一名海盗跳上了甲板。

pi.rate

n.（名词）

One who robs at sea or plunders the land from the sea without commission from a sovereign nation.
海盗，海上劫掠者：未受任何主权国家委派的海上抢劫或从海上来到陆地上抢夺的人
A ship used for this purpose.
海盗船：用于此目的的船
One who preys on others; a plunderer.
抢劫者：劫持他人的人；劫掠者
One who makes use of or reproduces the work of another without authorization.
侵犯版权者：未经授权而使用或复制他人作品的人
One that operates an unlicensed, illegal television or radio station.
非法播放者：未经允许而非法播放电视或广播的人
v.（动词）
pi.rat.ed,pi.rat.ing,pi.rates
v.tr.（及物动词）
To attack and rob (a ship at sea).
抢劫（海上船只）
To take (something) by piracy.
剽窃，盗用：通过剽窃途径获得
To make use of or reproduce (another`s work) without authorization.
非法翻印，非法仿制：未经授权而使用或复制他人（作品）
v.intr.（不及物动词）
To act as a pirate; practice piracy.
当海盗；从事劫掠行为

来源：
Middle English
中古英语
from Old French
源自 古法语
from Latin por3ta
源自 拉丁语 por3ta
from Greek peiratôs
源自 希腊语 peiratôs
from peiran [to attempt]
源自 peiran [企图]
from peira [trial] * see per- 3
源自 peira [审判] *参见 per- 3

【引伸】
pirat.ic
pirat.ically
adv.（副词）