Heck, i'm no dictionary bros, but here i go:
Tier
1. One of a series of rows placed one above another: a stadium with four tiers of seats.
2. A rank or class.
tiered, tier·ing, tiers. To arrange (something) into or rise in tiers: tier a wedding cake; balconies that tier upward. [Middle English tire, row, rank, from Old French, from tirer, to draw out. See TIRADE.]
One that ties: a tier of knots.
3. (n.) A continuous succession of persons or things
• row
• column
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So, basically the term we use here is a mix between all of them. Thank you thesaurus and AHD.
Tier
1. One of a series of rows placed one above another: a stadium with four tiers of seats.
2. A rank or class.
tiered, tier·ing, tiers. To arrange (something) into or rise in tiers: tier a wedding cake; balconies that tier upward. [Middle English tire, row, rank, from Old French, from tirer, to draw out. See TIRADE.]
One that ties: a tier of knots.
3. (n.) A continuous succession of persons or things
• row
• column
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So, basically the term we use here is a mix between all of them. Thank you thesaurus and AHD.