The best replacement for concatenate is ampersand.

The best alternatives to concatenate are rated as following:
★★★★★  ampersand
★★★★  append
★★★  catenate

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Speaking about concatenate, one probably shouldn't forget about leading zeros in excel.

Other search terms related to concatenate and their ratings are:
★★★★★ leading zeros in excel
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concatenate
ampersand
append