With regard to the fundamentals, but not to the particulars.(adverb)
According to theory.(adverb)
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Use "in principle" in a sentence
"For example, when Cheney strongly opposed a proposal by Baker and Scowcroft to seek a ban on multiwarhead land-based missiles in arms control negotiations with Moscow, they decided not to push the issue further, even though the president had in principle sided with them."
"The illustrious Wimpheling, born in 1450, taught education in principle and practice on orthodox lines."
"However, the Church maintains in principle the privilegium fori, even for those in minor orders, provided that they have the tonsure and wear clerical garb, and either already serve in a church or are preparing in a seminary or university for the reception of higher orders"