in-

I.
a prefix representing English in, as in income, indwelling, inland, but used also as a verb-formative with transitive, intensive, or sometimes little apparent force, as in intrust, inweave, etc. It often assumes the same phases as in-2, en-1, em-1, and im-3.

{Middle English and Old English; representing in (adverb)
II.
a prefix of Latin origin meaning primarily `in', but used also as a verb-formative with the same force as in-1, as in incarcerate, incantation.

Compare em-1, en-1. Also, il-, im-, ir-. {Latin, representing preposition in (in French en), related to in, (preposition)
Usage: This prefix derives from Latin, whereas the prefix with which it is sometimes in variation, en-, derives directly from French. Corpus evidence shows that in Australian English a distinction in meaning has arisen between ensure and insure. In other cases, for example enquire and inquire, the forms are interchangeable. Some organisations, such as newspapers, tend to standardise on the in- form, but there are also those who make a distinction between, for example, an official inquiry and an informal enquiry.
III.
a prefix of Latin origin corresponding to English un-, having a negative or privative force, freely used as an English formative, especially of adjectives and their derivatives and of nouns, as in inattention, indefensible, inexpensive, inorganic, invariable. This prefix assumes the same phonetic phases as in-2, as in impartial, immeasurable, illiterate, irregular, etc. In French it became en- and thus occurs unfelt in such words as enemy (French ennemi, Latin inimicus, literally, not friendly).

Also, il-, im-, ir-. {Latin; related to Greek an-, a- a-6, and un-1}

Australian English dictionary. 2014.

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