CC Ādi 13.37

ei ‘madhya-līlā’ nāma — līlā-mukhyadhāma
śeṣa aṣṭādaśa varṣa — ‘antya-līlā’ nāma
Word for word: 
ei — these; madhya-līlā nāma — named the middle pastimes; līlā — pastimes; mukhya-dhāma — principal place; śeṣa — last; aṣṭādaśa — eighteen; varṣa — years; antya-līlā — the final pastimes; nāma — named.
Translation: 
The activities of Lord Caitanya Mahāprabhu in His travels after He accepted sannyāsa are His principal pastimes. His activities during His remaining eighteen years are called the antya-līlā, or the final portion of His pastimes.