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*[yi2] before the 4th tone and before unaccented syllable: 一步，一次 [yi2bu4], [yi2ci4].
一則，二則 firstly, secondly, used in presenting different aspects of a situation;
一月 January;
一二八事變 , n., The Shanghai Incident of January 28, 1932;
一…一 one…the other: 一臧一否 (LL) one good and the other bad;
一方面 one aspect only, on the one hand;
一個回合 one bout, one round;
一則以喜，一則以懼 in one way, it is a cause for joy, in another, a matter of concern (said of parent's age);
不一而足 there are more than one;
一無，一不 or一…不 not one;
一無所知 (person) knows not a thing;
一無足取 not one good thing to be said about it;
一竅不通 an absolute blockhead;
一毛不拔 will not give a cent (to charity), lift a finger to help;
獨一無二 the one and only;
統一 unified control;
合一，合而為一 united as one.
(2) Once: 一之為甚，其可再乎 once is bad enough;
可一不可再 once is forgivable, not twice.
(3) One principle: 一以貫之 one principle runs through it all.
一一 one by one, see 一意 [yi1yi4]↓;
一神論 monotheism;
一二 or 一兩個 one or two, a couple: 一兩天 a couple of days;
一二十打 one or two dozens;
一二（兩）百 a couple of hundred;
一二朋友 one or two friends;
一來二去 gradually;
一差二錯 one or two mistakes;
一長兩短 should there be some unfortunate happenings;
一五一十 (descriptive) reckoning, enumerating on and on;
coupled with 半 meaning inadequately: 一知半解 know only superficially;
一年半載 in a year or so;
一顰一笑 every twinkle and smile;
the slightest of facial expression;
一笑置之 dispose it with a smile;
一文不值 to be not worth the paper on which it is written;
not worth a cent;
一言難盡 it's a long story (to tell).
(2) Each, a: 一桌十人 ten persons a table;
一舉一動 each and every move (is being watched, etc.);
一天三頓飯 three meals a day.
(3) Another: 蟬一名知了 another name for cicada is 知了.
(4) All, completely: 一心一意 with all one's heart and mind;
一年到頭 all the year round;
一身都是膽 the whole body is one mass of courage;
一律，一概 [yi1lU4], [yi1gai4]↓;
一向 all along, always, consistently, used to;
completely, entirely: 一如，一似 [yi1ru2], [yi1si4]↓;
一塌 [yi1ta1]↓;
一乾二淨 completely cleaned out;
一清二白 completely clear;
一敗塗地 utter failure or defeat, completely wiped out.
(5) So, such, to such extent: 一至 [yi1zhi4]1;
一何愚也 why so foolish?
(6) Same, together: 一同 [yi1tong2]↓;
其揆一也 the principles are the same;
一模一樣 look exactly alike;
一家人 (we are) of the same family or clan;
一丘之貉 foxes of the same hole (said of scoundrels “of the same ilk”);
一鼻孔出氣 say exactly the same thing (by collusion);
一視同仁 treat all alike without discrimination.
一失足成千古恨 (of a girl) once she takes a false step, she will regret it eternally;
歲一不登 once the harvest fails (people will starve);
一不做，二不休 once it is started, go through with it;
一見傾心 fall in love at first sight;
一見如故 feel like old friends at the first meeting;
一望而知 one glance and you know;
一說便知 once said it becomes clear;
一鳴驚人 make one's mark at the first shot, win popularity with the first work;
天氣一冷 the moment the weather gets cold;
一聽見這話 the moment one hears it.
(2) A little: 看一看 just have a look;
嘗一嘗 just have a taste (of food);
試一試 have a try at it;
試一試看 try and see;
裡邊一瞧 one swift look inside;
用手一摸 just touch (s.t.) with the hand.
(3) 一…一 alternately: 一張一弛 tense up and relax alternately.
2.一併 [yi2bing4], adv., together, along: 一併帶走 take it along with others.
3.一切 [yi2qie4], adj. & adv., all, the whole (contents, members, funds, things).
4.一起（兒） [yi4qi3] ([yi4qie1er0]), adj., (mix, live) together: 常在一起 are always together.
5.一齊 [yi4qi2], adv., together (go, walk, die, get rich, etc.).
6.一旦 [yi2dan0], adv. & conj., once (s.t. should happen): 一旦死了 should s.o. die one day.
7.一道兒 [yi2dao4er0], adv., (walk, go) together (“same route”).
8.一得 [yi4de2], phr., 愚者千慮，必有一得 (court.) a stupid person may once in a while have a good idea.
9.一點（兒） [yi4dian3] ([yi1diaaer0]), adj. & adv. & n., little, just a little, a small amount: 一點兒不怕 not the least bit afraid; 一點兒不錯 absolutely right.
10.一定 [yi2ding4], adj. & adv., certain, -ly.
11.一丟點兒 [yi4diu1diaaer0], adj. & adv. & n., just a tiny bit.
12.一堆兒 [yi4dueer0], (1) n., a heap, a pile (of things); (2) adv., (eat, work) together.
13.一概 [yi2gai4], adj. & adv. & n., all, without exception: 一概不准 all forbidden; 一概而論 to lump together.
14.一個個 [yi2ge0ge1], pron., each one, every one.
15.一貫 [yi2guan4], adj., consistent (policy).
16.一共 [yi2gong4], (1) adv., together (eat at the same table, etc.); (2) n., total amount, number: 一共六個人 altogether six persons.
17.一古腦兒 [yi2gu2nao3er0], adv. & n., altogether the whole lot (stolen, etc.).
18.一忽兒 [yi4hu1er0], n., in a short moment.
19.一晃兒 [yi4huang3er0], n., in a flash.
20.一會兒 [yi2hui4] ([yi2hueer0]), n., in a short moment: 請坐一會兒 sit down for a moment; 一會兒哭，一會兒笑 cry one moment and laugh the next.
21.一回兒 [yi4huerer0], adv. & n., ditto.
22.一家 [yi4jia1], phr., same family: 咱們是一家人 we are of the same family.
23.一己 [yi4ji3], adj., personal, private (affairs), opp. 公 public.
24.一至 [yi2zhi4]1, adv., to such extent: 何以一至於此極 how or why come (fail, suffer) to such extreme?
25.一致 [yi2zhi4]2, adj. & adv., unanimous, -ly (support, approve, etc.).
26.一直 [yi4zhi2], adv., consistently (appear, disappear), continually (absent, defiant, etc.).
27.一刻 [yi2ke4], n. & adv., a moment: 一刻不停 never stop for a moment.
28.一塊兒 [yi2kua4er0], adv., (eat. work) together.
29.一溜煙兒 [yi4liu4yan1] ([yi4liu4ya1er0]), adv., (slink) away and disappear (without permission or news).
30.一硫化 [yi4liu2hua1], n., (chem.) sulfide: 一硫化二銅 cuprous sulfide.
31.一零兒 [yi4ling2er0], n., adv., see [yi4diaaer0]↑.
32.一弄兒 [yi2long4er0], adv., (coll.) the whole lot; altogether.
33.一律 [yi2lU4], adv., all, without exception (stopped, forbidden, etc.).
34.一面 [yi2mian4], (1) n. adjunct, 一面鼓，一面旗 a drum, a flag; [yi2mian4], (2) adj. & adv. & n., one-sided (argument, view): 一面之緣 the pleasure of having met once; 獨當一面 (of officeholder) take charge as chief.
35.一仍 [yi4reng2], adv., still, as ever, see 仍 91A.50.
36.一日 [yi2ri4], adv., one day; such a day: 總有一日 there'll be one day when…; 較一日之長 let's see who is the better of the two of us.
37.一晌 [yi2shang3], n., a short moment.
38.一身 [yi4shen1], phr., whole body: 一身一口 a bachelor living singly.
39.一生 [yi4sheng1], n. & adv., the whole life, for the past whole life.
40.一下子 [yi2xia4zi0], adv., all at once.
41.一些 [yi4xie1], n., little, a few: 一些著涼 catch a little cold.
42.一順 [yi4shun4], adv., (dial.) see [yi4zhi2]↑; 一順兒，一順子 straight (ahead, east, etc.).
43.一時 [yi4shi2], adv., for a time, temporarily: 一時疏忽 (apologetic) it was an oversight at that time; 一時不能去 for the time being I cannot get away.
44.一似 [yi2si4], adv., just like (being home, etc.).
45.一塌 [yi4ta1], adv., completely: 一塌糊塗 is in a complete mess; 一塌括子 (Shanghai dial.) completely, the whole amount.
46.一頭 [yi4tou2], adv., (1) along with s.t. else: 一頭走，一頭哭 weeps as one walks along; 東一頭西一頭亂跑 run about in all directions; (2) suddenly: 一頭碰見 suddenly met; (3) a whole headful: 一頭株花 (wears) pearl decorations all over her hair.
47.一從 [yi2cong2], adv., ever since (=自從), also 一自 [yi2zi4]↓.
48.一次 [yi2ci4], adv., one time, once: 頭一次 the first time.
49.一同 [yi4tong2], adv., (go, work) together.
50.一統 [yi4tong3], n., unification (of country); centralization, uniformity (of ideas, beliefs).
51.一早兒 [yi4zao3er0], adv., in early morning.
52.一再 [yi2zai4], adv., again and again.
53.一昨 [yi4zuo2], adv., (LL) yesterday.
54.一總 [yi2zong3], adv. & n., altogether, the whole amount.
55.一自 [yi2zi4], adv., since.
56.一往 [yi4wang3], phr., 一往情深 deeply attached (to s.o.).
57.一味（兒） [yi2wei4] ([yi2weher0]), adv., persistently, doggedly: 一味兒讀書 study devotedly; 一味兒玩 just keep on playing; 一味兒與他反對 persistently oppose him.
58.一氧化 [yi4yang3hua4], n., (chem.) monoxide: 一氧化碳 carbon monoxide; 一氧化二氮 nitrogen monoxide.
59.一樣 [yi2yang4], adj. & adv., same, just as (convenient, etc.): 還不是一樣 is it not just the same?
60.一一 [yi4yi1], adv., one by one (count, explain, etc.).
61.一意 [yi2yi4], adv., (1) with complete devotion, full concentration; (2) stubbornly: 一意孤行 self-opinionated, self-willed.
62.一元論 [yi4yUan2lun4], n., monism.