haTha-yoga-pradiipika, IV 78 (79?) 78. Those who are ignorant of the Raja-Yoga* and practice only the Hatha-Yoga, will, in my opinion, waste their energy fruitlessly.
raaja-yogam ajaanantaH kevalaM haThakarmiNaH | etaan abhyaasino manye prayaasa-phala-varjitaan राज-योगमजानन्तः केवलं हठ-कर्मिणः । एतानभ्यासिनो मन्ये प्रयास-फल-वर्जितान् ॥ ७९॥ * That is any kind of transcendental meditation (for example TM) leading to samaadhi: 3-4. Raja Yoga, Samadhi, Unmani, Manonmani, Amaratwa, Laya, Tatwa, Sunya, Asunya, Parama Pada, Amanasska, Adwaitama, Niralamba, Niranjana, Jiwana Mukti, Sahaja, Turya, are all synonymous.
