214. The suffix "-ig-" is used to form verbs indicating the "causing,
rendering or bringing about" of that which is expressed in the root or
formation to which it is attached. Verbs containing the suffix "-ig-"
are called "causative verbs" and are always transitive (22).
a. Causative verbs from adjectival roots indicate that the quality or
condition expressed in the root is produced in the object of the verb:
dolcxigi, to sweeten, to assuage (from "dolcxa", sweet).
moligi, to soften (from "mola", soft).
plilongigi, to lengthen, to make longer (from "pli longa", longer).
faciligi, to facilitate (from "facila", easy).
beligi, to beautify (from "bela", beautiful).
[Footnote: The meaning often resembles that of the predicate nominative
(210), as:
Li faris la mondon gxoja,
he made the world glad.
Li gxojigis la mondon,
he gladdened the world.]
b. Causative verbs from verbal roots indicate that the action expressed
in the root is made to take place:
dormigi, to put to sleep (from dormi, to sleep).
konigi, to make acquainted with (from koni, to know).
mirigi, to astonish (from miri, to wonder).
mortigi, to kill (from morti, to die).
c. Causative verbs may be formed from noun-roots, prepositions, adverbs,
prefixes and suffixes whose meaning permits:
amasigi, to amass, to heap up (from amaso, pile).
kunigi, to unite, to bring together (from kun, with).
forigi, to do away with (from for, away).
ebligi, to render possible (-ebl-, 161).