n. A weekday on a Church calendar on which no feast is observed.
the GNU version of the Collaborative International Dictionary of English
n. A week day, esp. a day which is neither a festival nor a fast.
The Century Dictionary and Cyclopedia
n. In the Roman Catholic ecclesiastical calendar, any day of the week from Monday to Friday, inclusive—that is, any day but the Jewish and the Christian sabbath: as,feria secunda, tertia, etc.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. (in Spanish speaking regions) a local festival or fair, usually in honor of some patron saint
n. a weekday on which no festival or holiday is celebrated
Word Usage
"This past Wednesday at the Healing Mass at St. Alban's, there was no saint commemorated on the kalendar for that day what we call a feria, so we had a votive Mass for the Sick."