A Dominican from Rhode Island who has written and lectured extensively, Fr Vidmar has used as his modus operand] the six «ages» into which the historian Christopher Dawson famously divided the story of the Church. (faith.org.uk)
This is the function of the sacrament ex opere operands: without the prior disposition of the believing community there can be no sacramental effect. (religion-online.org)
Subjects assessed correctness of two and three operand equations. (semanticscholar.org)