यज्ञ (≠ sacrifice)
When the whole universe is divine then every act is an offering of love.
Where is the question of sacrifice when the one making the offering is just an aspect of the one receiving the offering?
The sound "gnya" (ज्ञ) in Sanskrit is the root of ज्ञान which means knowledge. Note, the sound "kn" in the English is a direct cognate of the Sanskrit ज्ञ.
So यज्ञ really means an offering for the purpose of the Supreme knowledge.
The most common usage of यज्ञ is in the context of fire ceremonies where various items are offered to Agni the deva of fire. In normal households elaborate fire offerings like these do not happen everyday, but when we eat our meals the whole ceremony of eating can be considered a यज्ञ because our digestive fire is consuming what we offer. In intense Hatha Yogic practice we consider our practice to be a Yagnya burning away our karmas and transmuting our baser elements into divine brilliance.
In fact, it is our contention that the entire Conscious Universe is going through a Yagnya at every moment.