Etymology 1
From Arabic لَيِّن (layyin).
Adjective
laini (invariable)
- smooth, soft (lacking friction, not rough)
Etymology 2
Borrowed from English line.[1]
Noun
laini (n class, plural laini)
- queue, line
- line
2020 January 21, “Je, ni nani waliozimiwa simu Tanzania?”, in BBC News Swahili:Idadi kubwa ya watu haijasajili laini zao za simu- A large number of people have not registered their phone lines
References
Batibo, Herman M. (1996) “Loanword clusters nativization rules in Tswana and Swahili: a comparative study”, in South African Journal of African Language, volume 16, number 2, →DOI, page 39 of 33-41