You use one another to indicate that each member of a group does something to or for the other members.
...young people learning to help themselves and one another.
The two countries do little trade with one another.
See full dictionary entry for another
English Easy Learning GrammarReflexive pronounsReflexive pronouns are used: person singular plural 1st2nd3rd masculine3rd feminine3rd neuterGeneral myselfyourselfhimselfherselfitselfoneselfourselvesyourselvesthemselvesthemselvesthemselves ... Read more
one another in British English
pronoun
the reflexive form of plural pronouns when the action, attribution, etc, is reciprocal
they kissed one another
knowing one another
Also: each other
one another in American English
each one the other; each other
see also each other, at each
See full dictionary entry for one
Examples of 'one another' in a sentence
one another
Opposite one another are two glass cases of stuffed mammals.
Times, Sunday Times (2016)
The two families knew one another.
Times, Sunday Times (2017)
Some 28 per cent said they needed one another equally.
Times, Sunday Times (2017)
It appears they have had time to get to know one another, just like any other normal couple.
The Sun (2016)
What you should both be trying to discover is how you can help one another's dreams to come true as a couple.
Times, Sunday Times (2017)
Agree with her that you can't see one another, at least for now.
The Sun (2016)
This process relies on the integrity of the group to call one another out.
Christianity Today (2000)
They both need help to cope with their bereavement without taking out their feelings on one another.
The Sun (2013)
You and your daughter blaming one another just makes life worse for them.
The Sun (2011)
But over the years we had got used to one another.
Times, Sunday Times (2008)
Or at least to please one another.
Times, Sunday Times (2006)
To turn its members against one another.
Times, Sunday Times (2011)
They go awry when those involved become suspicious of one another.
Times, Sunday Times (2011)
He was the eldest of three in a family that showed little affection for one another.
Turner, Janine Behind Closed Doors - advice for families with violence in the home (1988)
We were so in love when we married but now we just take one another for granted.
The Sun (2013)
One of the most pleasant aspects of this show is the way they help one another when things go awry.
Times, Sunday Times (2015)
They used to undercut one another -- take it for a few shillings less.
Smout, T.C. & Wood, Sydney Scottish Voices 1745-1960 (1990)
But for all their cultural exchanges, the two peoples generally regarded one another with something between amusement and disdain.