The best replacement for define is const.

The best alternatives to define are rated as following:
★★★★★  const
★★★★  enum
★★★  describe
★★★  declare
★★  const c++
★★  typedef
★★  require
★  const int
★  const objective c
★  inline
★  declare java
★  const arduino
★  static const
★  const php
★  constant
★  typedef c
★  parameter
★  let
  topaz denoise
  class puppet
  parameter verilog
  redefine
  explain
  identify
  require dojo

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Speaking about define, one probably shouldn't forget about further adieu.

Other search terms related to define and their ratings are:
★★★★★ further adieu
conviction
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define
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