Definitions from Wiktionary (tier)

▸ noun:  One who ties (knots, etc).
▸ noun:  Something that ties.
▸ noun:  (archaic) A child's apron.
▸ noun:  A row or range, especially one at a higher or lower level than another.
▸ noun:  A rank or grade; a stratum.
▸ noun:  (Australia) A (typically forested) range of hills or mountains, especially in South Australia or Tasmania; a mountain.
▸ noun:  A horizontal row of panels within a comic strip.
▸ verb:  (transitive) To arrange in layers.
▸ verb:  (transitive) To cascade in an overlapping sequence.
▸ verb:  (transitive, computing) To move (data) from one storage medium to another as an optimization, based on how frequently it is accessed.
▸ Also see tier

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