形容詞 redundant:

1. more than is needed, desired, or required
   同義詞：excess, extra, spare, supererogatory, superfluous, supernumerary, surplus
2. repetition of same sense in different words- J.B.Conant
   同義詞：pleonastic, tautologic, tautological

1. Skill has been made redundant by machine.
   由于使用機(jī)器，手藝已變得多余。
2. I regret having to make so many staff redundant.
   我很遺憾不得不裁減這么多職員。
3. There will be no question of anyone being made redundant.
   決不可能裁掉任何人。
4. In the sentence "She lives alone by herself", the word "alone" is redundant.
   在“她獨自一人單獨生活中”這個句子中，＂單獨”是多余的。

re.dun.dant

adj.（形容詞）
Exceeding what is necessary or natural; superfluous.
多余的：超出必需的或正常的；多余的
Needlessly repetitive; verbose.
累贅的：沒有必要重復(fù)的；冗長的
Electronics Of or involving redundancy in electronic equipment.
【電子學(xué)】 冗余的：電子設(shè)備冗余的或涉及電子設(shè)備中冗余的
Of or involving redundancy in the transmission of messages.
冗余的：傳輸信息中冗余的或涉及傳輸信息中冗余的

來源：
Latin redund3ns redundant- [present participle of] redund3re [to overflow]
拉丁語 redund3ns redundant- [] redund3re的現(xiàn)在分詞 [充滿]
re-, red- [re-]
re-, red- [前綴re-]
und3re [to surge] from unda [wave] * see wed-
und3re [起伏] 源自 unda [波動] *參見 wed-

【引伸】
redun.dantly
adv.（副詞）