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— in·vis·i·bly adverb

invisible hand noun : a hypothetical economic force that works for the benefit of all

in·vi·ta·tion·al adjective : limited to invited participants

— invitational noun

in·vite verb in·vit·ed; in·vit·ing 1 : ENTICE, TEMPT

2 : to increase the likelihood of

3 : to request the presence or participation of : ASK

4 : to request formally

5 : ENCOURAGE

— in·vi·ta·tion noun

in·vit·ing adjective : ATTRACTIVE, TEMPTING

in vi·tro adverb or adjective [ORIGIN: NL, lit., in glass]

: outside the living body and in an artificial environment

in·vo·ca·tion noun 1 : SUPPLICATION; especially : a prayer at the beginning of a service

2 : a formula for conjuring : INCANTATION

1invoice noun [ORIGIN: modif. of MF envois, pl. of envoi message]

: an itemized list of goods shipped usu. specifying the price and the terms of sale : BILL

Synonyms

account, bill, check, statement, tab—more at BILL

2invoice verb in·voiced; in·voic·ing : to send an invoice to or for : BILL

in·voke verb in·voked; in·vok·ing 1 : to petition for help or support

2 : to appeal to or cite as authority <~ a law>

3 : to call forth by incantation : CONJURE <~ spirits>

4 : to make an earnest request for : SOLICIT

5 : to put into effect or operation

6 : to bring about : CAUSE

in·vol·un·tary adjective 1 : done contrary to or without choice

2 : dictated by authority or circumstance : COMPULSORY

3 : not controlled by the will <~ contractions>

— in·vol·un·tari·ly adverb

Synonyms

[1] unintended, unintentional; also accidental, unplanned, unpremeditated; automatic, impulsive, instinctive, spontaneous, unprompted; inadvertent, unconscious, unknowing, unwitting

Antonyms

deliberate, intentional, unforced, voluntary, willful, willing

[2] compulsory, imperative, incumbent, mandatory, necessary, nonelective, obligatory, peremptory—more at MANDATORY

[3] automatic, mechanical, spontaneous—more at AUTOMATIC

in·vo·lute adjective : INVOLVED, INTRICATE

in·vo·lu·tion noun 1 : the act or an instance of enfolding or entangling

2 : the quality or state of being complex : COMPLEXITY, INTRICACY

in·volve verb in·volved; in·volv·ing 1 : to draw in as a participant

2 : ENVELOP

3 : to occupy (as oneself) absorbingly; especially : to commit oneself emotionally

4 : to relate closely : CONNECT

5 : to have as part of itself : INCLUDE

6 : ENTAIL, IMPLY

7 : to have an effect on

— in·volve·ment noun

Synonyms

[1] affect, concern, interest, touch—more at CONCERN

[3] absorb, busy, engage, engross, enthrall, fascinate, grip, immerse, interest, intrigue, occupy—more at ENGAGE

[5] carry, comprehend, contain, embrace, encompass, entail, include, number, take in—more at INCLUDE

in·volved adjective : marked by extreme and often needless or excessive complexity : INTRICATE, COMPLEX

Synonyms

complex, complicated, convoluted, detailed, elaborate, intricate, knotty, sophisticated—more at COMPLEX

in·vul·ner·a·ble adjective 1 : incapable of being wounded, injured, or damaged

2 : immune to or proof against attack

— in·vul·ner·a·bil·i·ty noun

— in·vul·ner·a·bly adverb

Synonyms

impregnable, indomitable, insurmountable, invincible, unbeatable, unconquerable—more at INVINCIBLE

1inward adjective 1 : situated on the inside

2 : MENTAL; also : SPIRITUAL

3 : directed toward the interior

Synonyms

inner, inside, interior, internal—more at INNER

2inward or in·wards adverb 1 : toward the inside, center, or interior

2 : toward the inner being

in·ward·ly adverb 1 : MENTALLY, SPIRITUALLY

2 : INTERNALLY

3 : to oneself

IOC abbreviation International Olympic Committee

io·dide noun : a compound of iodine with another element or group

io·dine noun 1 : a nonmetallic chemical element used esp. in medicine and photography

2 : a solution of iodine used as a local antiseptic

io·dise British variant of IODIZE

io·dize verb io·dized; io·diz·ing : to treat with iodine or an iodide