1one 
/ˈwʌn/ noun
plural ones /ˈwʌn/ noun 1 [count] : the number 1
▪ one, two, three, four, … 2 [count] US : a one-dollar bill
▪ I don't have any ones. Can you break a five? 3 [noncount] : one o'clock
▪ I'll be there at one. 4 [count] : the first in a set or series
▪ On day one of his diet, he cut out sweets. ▪ She wears a size one.
▪ one, two, three, four, …
▪ I don't have any ones. Can you break a five?
▪ I'll be there at one.
▪ On day one of his diet, he cut out sweets. ▪ She wears a size one.
as one
formal 1 : at the same time : all together
▪ They rose as one and cheered her. 2 : in agreement with each other
▪ We are as one on this issue.
▪ They rose as one and cheered her.
▪ We are as one on this issue.
at one with 1 : in a peaceful state as a part of something else
▪ I feel at one with nature. [=I feel very closely connected to nature] 2 formal : in a state of agreement with another person
▪ I am at one with you on this issue.
▪ I feel at one with nature. [=I feel very closely connected to nature]
▪ I am at one with you on this issue.
for one
: as an example
▪ I, for one, disagree. [=I disagree] ▪ There were many spelling mistakes in the essay. “There” for “their,” for one.
▪ I, for one, disagree. [=I disagree] ▪ There were many spelling mistakes in the essay. “There” for “their,” for one.
in one
: combined in a single thing
▪ a dictionary and thesaurus (all) in one ▪ a DVD and VCR player in one
▪ a dictionary and thesaurus (all) in one ▪ a DVD and VCR player in one
the odd one out — see 1odd
