Proto-Nakh: *cħa
Meaning: one
Chechen: cħaʔ
Ingush: caʕ
Batsbi: cħa
Comments: The final glottal stop is probably secondary (like in other numerals), but it led to an assimilatory development *cħaʔ > caʕ in Ing. (cf. without it forms like cħä "single", cħa-nne /obl. base of caʕ/ etc.).