vedyog.net

In English:

Swami Dayanand Saraswati Commentary : The four books of Rigveda and others, which are advised by the Supreme Lord, and containing true knowledge = sciences, by which men achieve true knowledge, are called ‘Vedas’.

Comment in English : Four Vedas are – Rigveda, Yajurveda, Saamaveda, and Atharvaveda.

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In Hindi:

महर्षि दयानन्द व्याख्या : जो ईश्वरोक्त, सत्य विद्याओं से युक्त ऋक् संहितादि चार पुस्तक हैं कि जिनसे मनुष्यों को सत्य-सत्य ज्ञान होता है, उनको 'वेद' कहते हैं ।