The words phenomena and alumni are plural nouns but are frequently used as if they were singular, as seen in the following examples:
- "This is a phenomena that has started since the entry of Reliance in the GSM market in January this year," said an analyst with a Mumbai-based brokerage. (www.livemint.com)
- Sometimes a phenomena called ballooning occurs in hydraulic circuits where the hydraulic brake hoses swell up after repeated braking... (www.team-bhp.com)
- An alumni of the famed Loyola College, Chennai, Shri Vaithilingam imbibed a zeal and commitment for public service from his student days. (http://speakerloksabha.nic.in)
- Lt. Gen. Rajinder Singh Sujlana is an alumni of National Defence Academy, Khadakvasla and the Indian Military Academy. (http://indianarmy.nic.in)
In these examples the singular forms, phenomenon and alumnus, were needed.
