c. 1600, "act of reinforcing," from reinforce + -ment. Meaning "an augmentation, an additional force, that which reinforces" is from 1650s. In psychology by 1876. Related: Reinforcements.
Entries linking to reinforcement
reinforce v.
also re-enforce, "add new force, strength, or weight to," c. 1600, originally in military sense, from re- "again" + inforce, variant of enforce "drive by physical force; fortify, strengthen" (compare re-enforce, and see en- (1)). Related: Reinforced; reinforcing.
The ordinary form (rein-) has been so far divorced from the simple verb (formerly inforce or enforce, now always the latter) that it seldom or never means to enforce again, as when a lapsed regulation is revived. For that sense re-enforce should be used. [Fowler]
-ment
common suffix of Latin origin forming nouns, originally from French and representing Latin -mentum, which was added to verb stems to make nouns indicating the result or product of the action of the verb or the means or instrument of the action. In Vulgar Latin and Old French it came to be used as a formative in nouns of action. French inserts an -e- between the verbal root and the suffix (as in commenc-e-ment from commenc-er; with verbs in ir, -i- is inserted instead (as in sent-i-ment from sentir).
Used with English verb stems from 16c. (for example amazement, betterment, merriment, the last of which also illustrates the habit of turning -y to -i- before this suffix).
The stems to which -ment is normally appended are those of verbs; freaks like oddment & funniment should not be made a precedent of; they are themselves due to misconception of merriment, which is not from the adjective, but from an obsolete verb merry to rejoice. [Fowler]
re-enforcement n.
also reenforcement, "act of re-enforcing; state of being re-enforced; that which gives fresh strength to," c. 1600, from re- "back, again" + enforcement or else formed as a noun to go with re-enforce. Compare reinforcement.