Wordnet's definitions

Congress

The act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur.

They had congress.

by Wordnet July 18, 2003

mantra

a commonly repeated word or phrase

She repeated "So pleased with how its going" at intervals like a mantra.

by WordNet February 15, 2005