Etymology tree
Proto-Italic *wre-
Latin re-der.
Old French re-bor.
Middle English re-
English re-
English inforce
English reinforce
Proto-Indo-European *-mn̥
Proto-Indo-European *-mn̥tom
Proto-Italic *-mentom
Latin -mentum
Old French -mentbor.
Middle English -ment
English -ment
English re(inforcement)
Latin ō
Old French ohbor.
Middle English o
English O
▲
Middle English o
English oh
English -o
English reo
From re(inforcement) + -o.
Meanings
(Australia, World-War-I, informal) A reinforcement (additional soldiers).
Etymology tree
Proto-Italic *wre-
Latin re-der.
Old French re-bor.
Middle English re-
English re-
English entry
English re(-entry)
Latin ō
Old French ohbor.
Middle English o
English O
▲
Middle English o
English oh
English -o
English reo
From re(-entry) + -o.
Meanings
(Australia, informal) A re-entry (climbing a wave and then returning down its face).
Etymology tree
English re(inforcing)
Latin ō
Old French ohbor.
Middle English o
English O
▲
Middle English o
English oh
English -o
English reo
From re(inforcing) + -o.
Meanings
(Australia, informal, uncountable) Steel used to reinforce concrete.