n. The minimum number of ten adult Jews required for a communal religious service.
the GNU version of the Collaborative International Dictionary of English
n. A quorum, or number necessary, for conducting public worship.
The Century Dictionary and Cyclopedia
n. In Jewish use, count; number; specifically, the number of ten males above thirteen years of age required for public worship and other religious practices in the synagogue.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the quorum required by Jewish law to be present for public worship (at least ten males over thirteen years of age)
Word Usage
"A minyan is a quorum of at least 10 Jewish adults required for public worship."