Can I use a variable throughout the entire script?

I am quite new to roblox scripting, I'm experienced with A similar language (Zero) in the past but don't know what to do here

This script is making a time variable for the entire scripts

time = 0  -- A time Variable for throughout the entire Workspace
while true do -- True boolean to repeat it all
	time = time + 1 -- add 1 to the time
	wait(1) -- wait .9 seconds in order to not overload the script
	if time == 820 then -- Makes sure the round can't go longer than 12 minutes
		time = 0 -- sets the time Variable back to 0
	end --ends the if statement
	print(time) --Prints "time" for debugging
end -- ends the While true

this is one of the many places I'm using that script

playerNames = game.Players:GetChildren() --Find the names of all the players
function kill() -- Kill all players
	for i = 1, #playerNames do --repeat until all the players are killed
		game.Workspace[playerNames[i].Name].Humanoid.Health = 0 --kill the player
	end ----finished
end -- Ends the kill() function

while true do
	if time >= 90 then --Time for people to choose character
		kill() -- Runs the kill() function
		
		if time >= 820 then
			for i=1, #playerNames do
				playerNames[i].TeamColor = BrickColor.new("White")
			end --Ends the "for" statement			
			kill() -- Runs the kill() function
		end --Ends this "if" statment
	end -- Ends the "if" statement
end

If it's the same script then yes, just define it outside any scope or omit any local from it. However, if it is a different script you will need to use _G which is Lua's global table.

_G["time"] = 0

You can reference to it by:

if _G["time"] > 1 then end

Read more about it here

@ipiano, I dont think he wants it global. He only wants it local i believe so do.

local time = 0

Explaination. putting local infront of time makes it a script value. but _G would make that value usuable thru every script.