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amen [amen 词源字典]: amen: [OE] Amen was originally a Hebrew noun, āmēn ‘truth’ (based on the verb āman ‘strengthen, confirm’), which was used adverbially as an expression of confirmation or agreement. Biblical texts translated from Hebrew simply took it over unaltered (the Greek Septuagint has it, for example), and although at first Old English versions of the gospels substituted an indigenous term, ‘truly’, by the 11th century amen had entered English too.
[amen etymology, amen origin, 英语词源]
else: else: [OE] Else shares its sense of ‘otherness’ with related words in other parts of the Indo- European language family. It comes ultimately from the base *al-, which also produced Latin alter ‘other’ (source of English alter) and alius ‘other’ (source of English alibi and alien) and Greek állos ‘other’ (source of the prefix allo- in such English words as allopathy, allophone, and allotropy). Its Germanic descendant was *aljo- ‘other’, whose genitive neuter case *aljaz, used adverbially, eventually became English else.
=> alibi, alien, alter
adverbial (adj.): 1610s, "pertaining to adverbs;" earlier it meant "fond of using adverbs" (1590s), from Late Latin adverbialis, from adverbium (see adverb). Related: Adverbially (mid-15c.).
amen: Old English, from Late Latin amen, from Ecclesiastical Greek amen, from Hebrew amen "truth," used adverbially as an expression of agreement (as in Deut. xxvii:26, I Kings i:36; compare Modern English verily, surely, absolutely in the same sense), from Semitic root a-m-n "to be trustworthy, confirm, support." Used in Old English only at the end of Gospels, otherwise translated as Soðlic! or Swa hit ys, or Sy! As an expression of concurrence after prayers, it is recorded from early 13c.
either: Old English ægðer, contraction of æghwæðer (pron., adv., conj.) "each of two, both," from a "always" (see aye (adv.)) + ge- collective prefix + hwæðer "which of two, whether" (see whether). Cognate with Dutch ieder, Old High German eogiwedar, German jeder "either, each, every").

Modern sense of "one or the other of two" is late 13c. Adverbially, for emphasis, "in any case, at all," especially when expressing negation, by 1828. Use of either-or to suggest an unavoidable choice between alternatives (1931) in some cases reflects Danish enten-eller, title of an 1843 book by Kierkegaard.
speed (n.): Old English sped "success, a successful course; prosperity, riches, wealth; luck; opportunity, advancement," from Proto-Germanic *spodiz (cognates: Old Saxon spod "success," Dutch spoed "haste, speed," Old High German spuot "success," Old Saxon spodian "to cause to succeed," Middle Dutch spoeden, Old High German spuoten "to haste"), from PIE *spo-ti-, from root *spe- (1) "to thrive, prosper" (cognates: Sanskrit sphayate "increases," Latin sperare "to hope," Old Church Slavonic spechu "endeavor," Lithuanian speju "to have leisure").

Meaning "rapidity of movement, quickness, swiftness" emerged in late Old English (at first usually adverbially, in dative plural, as in spedum feran). Meaning "rate of motion or progress" (whether fast or slow) is from c. 1200. Meaning "gear of a machine" is attested from 1866. Meaning "methamphetamine, or a related drug," first attested 1967, from its effect on users.

Speed limit is from 1879 (originally of locomotives); speed-trap is from 1908. Speed bump is 1975; figurative sense is 1990s. Full speed is recorded from late 14c. Speed reading first attested 1965. Speedball "mix of cocaine and morphine or heroin" is recorded from 1909.