Not sure if one or more

With one I am just one, or more
With two I am no more, or one and more
With three I am just one, no more
With four I am just one, or more, or one of more I'm sure
With five I am just one, or more, and ultimately either or
With six I am just one, or more, and one or more before

I think you are

united

With one I am just one, or more

u $\rightarrow$ "you" can refer to one person or multiple people.

With two I am no more, or one and more

un is a prefix that means a lack or reversal of something. It also means "a" in Spanish, which refers to a single thing or can refer to a larger set of things like "a group of people". Additionally this represents the UN (United Nations) which is plural.

With three I am just one, no more

uni is a prefix meaning consisting of one.

With four I am just one, or more, or one of more I'm sure

unit is a single thing or a part consisting of many things or one of many constituent parts.

With five I am just one, or more, and ultimately either or

unite is to combine multiple parts into one. The action can be done by one (“the company will unite with its competitors”) or many (“the companies will unite into one”).

With six I am just one, or more, and one or more before

united - the same as the previous line, but since it is "before", it is past tense.

• for the "with two" result, it makes sense when looking at its meaning in French – Green Apr 24 '18 at 23:56
• Oh yes, you got the original for the full 100% right! There's one more "group abbreviation" I tried to include with my edit for line 2. – OnlyF Apr 25 '18 at 3:48
• Added. I had that at first but changed my mind. It's there now. – tyobrien Apr 25 '18 at 3:51
• That's the one, almost forgot but the title is a hint too, for the difference between "things" and "people" for line 5 and 6. – OnlyF Apr 25 '18 at 4:22

Are you

1 (binary one padded with zeros in front depending on length)

With one I am just one, or more

01 - with one 0 = 1 or more if we add more 1s at the end

With two I am no more, or one and more

001 still = 1 and more if we add more 1s like above

With three I am just one, no more

0001 = 1

With four I am just one, or more, or one of more I'm sure

00001 same as above

With five I am just one, or more, and ultimately either or

000001 same as above

With six I am just one, or more, and one or more before

0000001 same as above

• Er...could you please explain how it works? – NL628 Apr 22 '18 at 18:15
• Because I'm pretty sure you have a good idea, but like my slow brain isn't catching up to the 3rd, 4th, or 5th lines... – NL628 Apr 22 '18 at 20:08
• I'm not home for the moment, I'll expand my answer when I get home, it's hard to elaborate on a cracked screen cellphone. – PmanAce Apr 22 '18 at 21:09
• +1 from me for the answer (which makes it more..), I like your thinking but not the answer for sure, it is a word I'm looking for. – OnlyF Apr 23 '18 at 13:33
• "One" is a word hehe ;) – PmanAce Apr 23 '18 at 13:34