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1. Through: diachronic.
2. Across: diatropism.
[Greek, from dia, through.]
1. through, throughout, or during: diachronic.
2. across: diactinic.
3. apart: diacritic.
4. (Botany) (in botany) at right angles: diatropism.
5. in opposite or different directions: diamagnetism.
[from Greek dia through, between, across, by]
a prefix occurring orig. in loanwords from Greek, with the meanings “through, across, from point to point” (diachronic; diameter; diarrhea), “in different directions, apart, at an angle” (dialysis; diastole ), “completeness or thoroughness (of the action of the verb)” (diagnosis).Also, esp. before a vowel, di-.
A prefix meaning "through" or "across," as in diameter, the length of a line going through a circle.