Nuns’ rules and their analysis
Nuns’ Expiation (Pācittiya) 78
… at Sāvatthī in the Jeta Grove in Anāthapiṇḍika’s monastery. Now at that time a certain probationer, having approached the nun Thullanandā, asked for the upasampadā, ordination. The nun Thullanandā spoke thus to that probationer: “If you, lady, will wait upon me for two years, then will I ordain you,” and having said (this) … see Bi-Pc.77.1 … “… this rule of training:
“Whatever nun, having said to a probationer: ‘If you, lady, will wait upon me for two years, then will I ordain you,’ (yet) if she is not afterwards prevented, should neither ordain her nor should make an effort to get her ordained, there is an offence of expiation.”
Probationer means: one who has trained for two years in the six rules.
‘If you, lady, will wait upon me for two years’ means: if you will attend upon me for two years.
‘Then will I ordain you,’ means: then will I confer the upasampada, ordination on you.
If she is not afterwards prevented means: … see Bi-Pc.77.2 … if she is the first wrong-doer.