IPA: /ˈsɒlɪdə/
KK: /ˈsɑlɪdər/
More firm or stable than something else.
This table is solider than the one we had before.
Comparative: solider
Superlative: solidest
The word 'solider' is derived from 'solid' (from Latin 'solidus', meaning firm or strong) and the suffix '-er' (meaning a person who). A solider is a person who is firm or strong, often in the context of military service.
Think of someone who is 'strong' ('solid') and is a 'person' ('-er') — that's why a solider is someone who is strong, often in a military sense.