1
- a person or animal with whom one spends a lot of time or with whom one travels同伴, 伴侣; 同行者：
his travelling companion
他的旅伴
figurative 〈喻〉fear became my constant companion.
我经常感到害怕。
1.1
- a person who shares the experiences of another, especially when these are unpleasant or unwelcome有共同经历（尤指共患难）的人：
my companions in misfortune.
我的患难之交。
1.2
- a person with similar tastes and interests to one's own and with whom one has an enjoyable, friendly relationship志趣相投者; 朋友：
they were drinking companions.
他们是酒友。
1.3
- used euphemistically to denote a person's long-term sexual partner outside marriage〈婉〉情人; 婚外长期性伴侣。
1.4
- a person, especially an unmarried or widowed woman, employed to live with and assist another职业伴侣（尤指未婚、寡居女性）。
1.5
- Astronomy a star, galaxy, or other celestial object that is close to or associated with another【天文】伴星。
2
- one of a pair of things intended to complement or match each other成对物之一; 成套物之一：
as modifier a companion volume.上（或下）册, 姐妹卷。
2.1
- usu. in names a book that provides information about a particular subject指南, 手册; 参考书：
the Oxford Companion to English Literature.
《牛津英国文学指南》。
2.2
- Brit. dated a piece of equipment containing several objects used in a particular activity〈英, 旧〉（一件）成套用具：
a traveller's companion.
旅行者套装。
3
Companion
a member of the lowest grade of certain orders of knighthood最低级爵士：a Companion of the Order of Canada.
加拿大勋位最低级爵士。
词源
Middle English: from Old French compaignon, literally 'one who breaks bread with another', based on Latin com- 'together with' + panis 'bread'.
1
- a covering over the hatchway leading to a ship's companionway升降口围罩。
1.1
- archaic a raised frame with windows on the quarterdeck of a ship to allow light into the decks below〈古〉甲板天窗。
1.2
- short for COMPANIONWAY.COMPANIONWAY的简称。
词源
mid 18th cent.: from obsolete Dutch kompanje （earlier form of kampanje） 'quarterdeck', from Old French compagne, from Italian （camera della） compagna '(storeroom for) provisions'.