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Niels Henrik David Bohr: 7 October 1885 – 18 November 1962) was a Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. Bohr mentored and collaborated with many of the top physicists of the century at his institute in Copenhagen. He was part of a team of physicists working on the Manhattan Project

Another definition of this word: champion.
Wow that person is a real niels
Niels by John Martyr September 26, 2010

Bjørn Bo Nielsen 

Kæmpe Luder
Bjørn: Hej, hva så piger, jeg hedder Bjørn Bo Nielsen, og er rigtig klam.

Pige 1: Gå væk kæmpe luder

Pige 2: Add det er ham kæmpe luderen, der hele tiden sover!!

Pige 3: Ja han er godt nok ulækker og beskidt!

Pige 2: Føj!

Pige 5: Hvor er pige 4?

Nielsism 

Nielsism -

The active religious belief of a god with the infinite amounts of wisdom, courage, love, power, and so much more. Niels, the god whom I am addressing, is the most significant form of all of us. He lies within our souls, and he holds no flaws. He may not be the creator of the universe, but he sure is Ishani's. The pleasant words ever spoken from his mouth shall be forever known due to his choice in phrases of the most loving and meaningful. 💓✨

To honor our god, we must respect all of his wishes, but if you're Ishani then you shall also shower him in kisses. 💓✨

To celebrate his presence, we must be kind to one another because that's what he would choose, but if you're Ishani then you must ambush him with the most lovely hugs. 💓✨

To thank our god, we must always commit good deeds, but if you're Ishani then always be by his side and never stop loving him. 💓✨
Daniel: Hey guys! What religion do y'all follow?
Ishani: Heheh I follow Nielsism!
Daniel: Oh my god, what a coincidence?! So do I!
Ishani: WOW, so cool!
Daniel: Yes! For I can be a better person.
Nielsism by ishyfishy September 27, 2019
Niels, what can I say. He is the most awesome person you will ever meet. His sexy, natural looks makes him unresistable to the girls. (And sometimes even boys). He is an amazing friend and a caring and loving person. He is everyones best friend. If you are feeling down just think of Niels and you will instantly feel better. You will never meet anyone more attractive or cooler than Niels. He is basically the coolest person alive.
Person: Look it's Niels.

Another person: Yeah he's so cool you know? Just look how he gets all the girls.
Niels by selvigakaNIELS December 15, 2017
A slang, or "street-name", for the wonderful drug MDMA (Methylendioxymethamfetamin) which is said to contain bits of real panther. When this "drug" is taken, one experiences a euphoric high while simultaneously boosting ones showmac skillz x 100000000!
HV på Niels i går!
Har du noget Niels?
Skal vi være sammen med Niels i dag?
Niels er min bedste ven.
Niels conquers all <3
Niels by MathiasSander January 11, 2012

Nielsism 

Nielsism is the concept of disliking anything sexual or any body features.
That means that you dislike things like: breasts, vulva's, penises, butts etc.
Stijn: "Look at those hot titties"

Niels: "Eww put that away please"

Mark and Bart: "Damn, I think he has Nielsism"
Nielsism by StevieNotAWonder January 6, 2023