The phrase "a single critical" is not correct and lacks clarity in written English.
It may be intended to describe one important or essential element, but it needs additional context to be meaningful.
Example: "In this analysis, we will focus on a single critical factor that influences the outcome."
Alternatives: "one key" or "a crucial".
It hysterically criticised the "national fascist" regime that took over in Kiev while saying not a single critical word abut Russia.
Transition seeks to "unleash the collective genius of a community," as Hopkins often puts it — to unify a town behind a single, critical purpose.
A hospital unable to staff its intensive care unit with a single critical care specialist can have several experts monitoring their patients remotely 24 hours a day.
Many of the world's leading health experts will gather for an emergency meeting in Geneva on Monday to debate a single critical issue: does the outbreak of Zika virus disease in South and Central America represent an international health crisis?
This is described below for a single critical bus; further work will consider multiple critical buses.
Even at a moment when there isn't a single dominant critical voice, criticism as a whole is amplified by various venues (such as Rotten Tomatoes and Metacritic) and by the increased speed and quantity of quasi-public discussion, whether via e-mail or on blogs, Twitter, or other social-networking sites.
The critical care service is run as a discrete directorate with a single general critical care unit on each site.
It is now painfully clear that, just as there is no one way to release an album, there is no single critical response anymore.
Not a single resolution critical of the Palestinian leadership, or concerning any other global issue for that matter, was adopted during the meeting.
Mitchell wrote that "none of MSNBC's five prime-time, liberal, hosts last night or their guests would utter a single word critical of Israel in the current conflict with Gaza".
