Adamite (n.)youdaoicibaDictYouDict[Adamite 词源字典]
"human being, descendant of Adam" the Biblical first man, 1630s, from Adam + -ite (1). Used from 1620s in reference to sects or groups that practice nudism, in reference to the state of Adam before the Fall.[Adamite etymology, Adamite origin, 英语词源]
adapt (v.)youdaoicibaDictYouDict
early 15c. (implied in adapted) "to fit (something, for some purpose)," from Middle French adapter (14c.), from Latin adaptare "adjust," from ad- "to" (see ad-) + aptare "join," from aptus "fitted" (see apt). Meaning "to undergo modification so as to fit new circumstances" (intransitive) is from 1956. Related: Adapting.
adaptability (n.)youdaoicibaDictYouDict
1660s, from adapt + -ability.
adaptable (adj.)youdaoicibaDictYouDict
1800, from adapt + -able.
adaptation (n.)youdaoicibaDictYouDict
c. 1600, "action of adapting," from French adaptation, from Late Latin adaptationem (nominative adaptatio), noun of action from past participle stem of adaptare (see adapt). Meaning "condition of being adapted" is from 1670s. Sense of "modification of a thing to suit new conditions" is from 1790. Biological sense first recorded 1859 in Darwin's writings.
adapter (n.)youdaoicibaDictYouDict
1801, agent noun from adapt. Electrical engineering sense from 1907.
add (v.)youdaoicibaDictYouDict
late 14c., "to join or unite (something to something else)," from Latin addere "add to, join, attach, place upon," from ad- "to" (see ad-) + -dere comb. form meaning "to put, place," from dare "to give" (see date (n.1)). Meaning "to do sums, do addition" also is from late 14c. Related: Added; adding. To add up "make sense" is from 1942.
add-on (n.)youdaoicibaDictYouDict
"additional component," 1941, from add (v.) + on.
added (adj.)youdaoicibaDictYouDict
"additional," c. 1600, past participle adjective from add (v.).
addendum (n.)youdaoicibaDictYouDict
1794, literally "something added," from Latin addendum, neuter of addendus "that which is to be added," gerundive of addere (see add (v.)). Classical plural form is addenda.
adder (n.)youdaoicibaDictYouDict
Old English næddre "a snake, serpent, viper," from Proto-Germanic *nædro "a snake" (cognates: Old Norse naðra, Middle Dutch nadre, Old High German natra, German Natter, Gothic nadrs), from PIE root *netr- (cognates: Latin natrix "water snake," probably by folk-association with nare "to swim;" Old Irish nathir, Welsh neidr "adder").

The modern form represents a faulty separation 14c.-16c. into an adder, for which see also apron, auger, nickname, humble pie, umpire. Nedder is still a northern English dialect form. Folklore connection with deafness is via Psalm lviii:1-5. The adder is said to stop up its ears to avoid hearing the snake charmer called in to drive it away. Adderbolt (late 15c.) was a former name for "dragonfly."
addict (v.)youdaoicibaDictYouDict
1530s (implied in addicted), from Latin addictus, past participle of addicere "to deliver, award, yield; give assent, make over, sell," figuratively "to devote, consecrate; sacrifice, sell out, betray" from ad- "to" (see ad-) + dicere "say, declare" (see diction), but also "adjudge, allot." Earlier in English as an adjective, "delivered, devoted" (1520s). Related: Addicted; addicting.
addict (n.)youdaoicibaDictYouDict
1909, in reference to morphine, from addict (v.).
addicted (adj.)youdaoicibaDictYouDict
1530s, "delivered over" by judicial sentence; past participle adjective from addict (v.). Modern sense of "dependent" is short for self-addicted "to give over or award (oneself) to someone or some practice" (1560s; exact phrase from c. 1600); specialization to narcotics dependency is from c. 1910.
addiction (n.)youdaoicibaDictYouDict
c. 1600, "tendency," of habits, pursuits, etc.; 1640s as "state of being self-addicted," from Latin addictionem (nominative addictio) "an awarding, a devoting," noun of action from past participle stem of addicere (see addict (v.)). Earliest sense was less severe: "inclination, penchant," but this has become obsolete. In main modern sense it is first attested 1906, in reference to opium (there is an isolated instance from 1779, with reference to tobacco).
addictive (adj.)youdaoicibaDictYouDict
1815, a word in chemistry and medicine; 1939 in the narcotics sense, from addict (v.) + -ive. Related: Addictively; addictiveness.
addition (n.)youdaoicibaDictYouDict
late 14c., "action of adding numbers;" c. 1400, "that which is added," from Old French adition "increase, augmentation" (13c.), from Latin additionem (nominative additio) "an adding to, addition," noun of action from past participle stem of addere (see add). Phrase in addition to "also" is from 1680s.
additional (adj.)youdaoicibaDictYouDict
1640s, from addition + -al (1). Related: Additionally.
additive (adj.)youdaoicibaDictYouDict
1690s, "tending to be added," from Latin additivus "added, annexed," from past participle stem of addere (see addition).
additive (n.)youdaoicibaDictYouDict
"something that is added" to a chemical solution or food product, 1945, from additive (adj.).