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Definition 2024

(emphatic) Not.
- 1898, Winston Churchill, chapter 3, in The Celebrity:
  Now all this was very fine, but not at all in keeping with the Celebrity's character as I had come to conceive it. The idea that adulation ever cloyed on him was ludicrous in itself. In fact I thought the whole story fishy, and came very near to saying so.
He's not at all friendly towards his ex-wife.‎
(idiomatic) Used similarly to you're welcome, as a conventional reply to an expression of gratitude.
Thank you for this very thoughtful present. — Not at all.‎

(emphatically: not): by no means, hardly, in no way, not in the least, not in the slightest, not the least bit, not the slightest bit
(conventional reply to expression of gratitude): don't mention it, forget it, it's nothing, no problem, that's all right, that's OK, think nothing of it, you're welcome; see also Wikisaurus:you're welcome

not

Chinese:
Mandarin: 毫不 (zh) ‎(háobù), 並不 (zh), 并不 (zh) ‎(bìngbù), 決不 (zh), 决不 (zh) ‎(juébù), 並未 (zh), 并未 (zh) ‎(bìngwèi)
Danish: overhovedet ikke, slet ikke
Dutch: helemaal niet
Esperanto: tute ne
Estonian:
Finnish: ei lainkaan, ei yhtään
French: pas du tout (fr)
German: überhaupt nicht
Greek: καθόλου (el) ‎(kathólou)
Ido: tote ne
Italian: ^{(please verify)}non ... per niente

Japanese: 全然 (ja) ‎(ぜんぜん, zenzen)
Korean: 결코 (ko) ‎(gyeolko)
Kurdish:
Sorani: نه‌خێر (ku)
Macedonian: во́општо не ‎(vóopšto ne), ни́малку ‎(nímalku), ич ‎(ič) (colloquial)
Polish: wcale nie
Portuguese: nada (pt), não... em nada, não... em absoluto
Russian: во́все нет ‎(vóvse net), отню́дь (нет) ‎(otnjúdʹ (net)), ничу́ть не ‎(ničútʹ ne) (colloquial, followed by adjectives or adverbials)
Scots: no ava
Spanish: en absoluto, para nada
Swedish: inte alls, alls inte, rakt inte

conventional reply to expression of gratitude

Arabic: عَفْوًا ‎(ʿafwan), عَلَى الرُحْب وَالسَّعَة ‎(ʿalā r-ruḥb wa-s-saʿa), اَلْعَفْو ‎(al-ʿafw)
Moroccan: لا شكرا على واجب
Armenian: խնդրեմ ‎(xndrem)
Azeri: dəyməz
Belarusian: няма́ за што́ ‎(njamá za štó), калі́ ла́ска ‎(kalí láska)
Bulgarian: ня́ма защо́ ‎(njáma zaštó)
Catalan: de res (ca)
Chinese:
Mandarin: 不客氣 (zh), 不客气 (zh) ‎(bù kèqi), 不用謝, 不用谢 ‎(bùyòngxiè), 不謝, 不谢 ‎(bùxiè)
Czech: není zač (cs), prosím (cs), rádo se stalo (cs), za málo
Esperanto: ne dankinde (eo)
Finnish: ei lainkaan, eipä kestä (fi)
French: de rien (fr) (it’s nothing), il n'y a pas de quoi (fr), pas de quoi (fr)
Georgian: არაფრის ‎(arapris), არაფერს ‎(arapers)
German: bitte (de), gern geschehen (de), keine Ursache (de)
Greek: τίποτα (el) ‎(típota)
Hindi: कुछ नहीं ‎(kuch nahī̃)
Hungarian: nincs mit (hu)
Ido: ne dankinde
Italian: prego (it), non c'è di che (it)
Japanese: どう致しまして ‎(どういたしまして, dō itashimashite), とんでもない (ja) ‎(tonde mo nai), いいえ (ja) ‎(iie) (informal)
Khmer: អញ្ជើញ (km) ‎(əñjerñ)
Korean: 천만에요 ‎(cheonmaneyo), 아니에요 (ko) ‎(anieyo)
Lao: ບໍ່ເປັນຫຍັງ ‎(bǭ pen nyang)

Latvian: nav par ko (lv)
Lithuanian: nėra už ką
Macedonian: не́ма на што ‎(néma na što), по́велете и друг пат ‎(póvelete i drug pat), молам ‎(mólam)
Mongolian: зүгээр (mn) ‎(zügeer)
Persian: قابل نداشت ‎(qâbel nadašt), خواهش می‌کنم (fa) ‎(xaheš mi-konam)
Polish: proszę (pl), nie ma za co
Portuguese: de nada (pt), por nada
Russian: не́ за что (ru) ‎(né za što), пожа́луйста (ru) ‎(požálujsta) (read: požálusta), не сто́ит благода́рности (ru) ‎(ne stóit blagodárnosti), на здоро́вье (ru) ‎(na zdoróvʹje)
Serbo-Croatian:

Cyrillic: нема на чему, молим

Roman: nema na čemu, molim (sh)
Slovak: nie je za čo, za málo, prosím
Slovene: ni za kaj
Spanish: de nada (es), no hay de qué
Swedish: ingen orsak (sv), det var så lite (sv)
Thai: ไม่เป็นไร ‎(mâi bpen rai) (it’s nothing)
Turkish: önemli değil, bir şey değil, rica ederim (tr)
Ukrainian: нема́ за́ що ‎(nemá zá ščo), будь ла́ска (uk) ‎(budʹ láska)
Vietnamese: không có gì (it’s nothing), không có chi