Senario or Scenario? Which is correct?

Scenario is the correct spelling of the word that means a certain situation. Senario is incorrect and should not be used in English. 

We need to think of a scenario where she is not present.

Is there a scenario where I could be the good guy

Scenario

A scenario is a noun that often means a hypothetical situation where different possible outcomes are possible. 

Scenario is also used in the Arts to describe a rough draft of what the characters in a play/novel/movie may act out. 

Senario

Senario is a common misspelling of scenario possibly because the c is a soft c when pronouncing the word. 

Is scenario singular or plural?

Scenario is the singular form of the word and scenarios is the plural form of the word.

We went through a number of scenarios before reaching a conclusion. 

Conor