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! Type in unicode polytonic Greek using beta code as indicated below:
/a => ά \a => ὰ =a => ᾶ )a => ἀ
(a => ἁ !a => ᾳ +i => ϊ h => η
q => θ x => χ c => ξ z = ζ
j => ψ w => ω s => σ, ς  
Combine punctuation marks when necessary e.g. )/a => ἄ
συναθροίζω

át. ant. ξυναθροίζω
1   ajuntar; reunir: σ. εἰς ἕν ar. juntar em um todo

pas.
2   reunir-se; comprimir-se
3   unir-se a; aderir a, dat. 〈σύν, ἁθροίζω〉