masc nom pl of sammāvāca (adj); fem nom sg of sammāvāca (adj); fem nom pl of sammāvāca (adj); nt nom pl of sammāvāca (adj); …
Analysis. sam- (together, with; bringing into unity) + mā- (not; negation) + vāca (speech) = 'speech brought into proper form' or 'unified and correct speech'. In the Eightfold Path context, sammāvācā denotes speech brought into alignment with ethical conduct: avoidance of lying, slander, harsh words, and idle gossip.
Etymology. saṁ (together, bringing into unity, as in samādhi 'placing together'; cognate with English same, Latin similis) + mā (the negative verbal root mā 'not' or the prefix a-/an- operating here as 'properly ordered'); vāca from √vac 'speak' (English 'voice', Latin vōx). The compound represents ethical speech unified and ordered according to the Dhamma.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version