The phrase "a lone action" is correct and usable in written English.
It can be used to describe an action that is performed alone or without assistance from others.
Example: "In a moment of bravery, she took a lone action to stand up for what she believed in, despite the risks involved."
Alternatives: "an isolated act" or "a solitary deed".
"We cannot change the situation with one lone action," Mr. Sharon said.
Confined to a single location -- a snazzy beachfront property -- and a lone weekend, the action (such as it is) centers on four friends who have convened to celebrate the birthday of a fifth.
He's a man of action, a lone wolf who knows how to get things done and cannot stand the red tape of bureaucrats who want to analyze intelligence through computers and data.
Executives of Allied Irish Bank woke up yesterday morning and announced they had lost $750 million, all because of the actions of a lone currency trader in its subsidiary in Baltimore.
You can't be a "lone wolf" when your violent actions are supported by rhetoric from a major political party.
But, Ms. Dargis added, "it also serves Mr. Nolan's larger meaning in 'The Dark Knight Rises' and becomes his final say on superheroes and their uses because, as Gotham rages and all seems lost, the action shifts from a lone figure to a group, and hope springs not from one but many".
And except for a couple of weird variations (an additional jumbo-sized ball that for some reason is inserted into the second round, and a "regenerator" feature that enables a lone player to call back into action his eliminated teammates), the game is essentially the old gym-period standby, though the refs are a good deal more tolerant of crotch-pegging than they ever were in middle school.
The stage action is introduced by a lone woman (Virginia Pilgrim), whose role is ambiguous: she may be the river, or the subsequent dances may be her memory.
