konkatena fu'ivla

x1 (sequence) is the concatenation of sequences x2 and x3 (and x4, x5, ...)

x1 is a string composed of exactly substrings which are the various xi's (i>1) in the order of increasing i value, starting with i=2, without skipping. See also: porsi. Operator/connective: joi'i.

In notes:

mekso string operator (n-ary): formal right-concatenation; X1 + X, where Xi is a string/word/text/character/letteral/lerfu/quoted utterance (quote appropriately iff necessary; preserve and be careful about the use-vs.-mention distinction) for all i.
accepts number (n) after: repeat last sumti up to n times