いらっしゃる

Originally a contraction of いらせらる (iraseraru), itself an honorific conjugation of 入ら (ira, the 未然形 (mizenkei, “imperfective”) of verb iru, “to come in, to go in; to arrive; to be in a place”) + せ (se, the 未然形 (mizenkei, “imperfective”) of honorific auxiliary verb su) + らる (raru, the older form of passivizing auxiliary verb rareru, here serving as another honorific).[1][2]

• (Tokyo) いらっしゃ​る [ìrássháꜜrù] (Nakadaka – [4])[3]
• IPA^(key): [iɾa̠ɕːa̠ɾɯ̟ᵝ]

いらっしゃる (intransitive, irregular conjugation, rōmaji irassharu)

1. (honorific) to go
   • 1994, Uchida, Yasuo, 三州吉良殺人事件 (Sanshū Kira Satsujin Jiken, “Murder in Kira, Sanshū”), Tōkyō: Kadokawa Shoten Publishing Co., Ltd, →ISBN Invalid ISBN, pages 304:

     孫娘 (まごむすめ)は身 (み)をよじらんばかりに恐縮 (きょうしゅく)して、「あの、これからどちらへいらっしゃるのでしょうか？」と訊 (き)いた。

     Magomusume wa mi o yojiran bakari ni kyōshuku shite, “ano, kore kara dochira e irassharu no deshō ka?” to kiita.

     The granddaughter asked, so shyly that she was practically writhing, "Um, where might you be going next?"

2. (honorific) to come
   • 1977, Ushio, Michio, 美しい村 (Utsukushii Mura, “Beautiful Village”)‎, Google Play Books, page 351:

     でも一体 (いったい)、何 (なん)時 (じ)ごろあなた方 (がた)はこちらへいらっしゃるのかしら？

     Demo ittai, nanji goro anatagata wa kochira e irassharu no kashira?

     But then, around what time would you be coming, I wonder?

3. (honorific) to be

   山田 (やまだ)さんがいらっしゃいますでしょうか。

   Yamada-san ga irasshaimasu deshō ka.

   Is Yamada-san there? (such as when telephoning a place of business)

   お元 (げん)気 (き)でいらっしゃいますか。

   O-genki de irasshaimasu ka.

   Are you doing well?

As listed above, this term can variously mean going, coming, or being in one place. Which meaning is intended depends on context. Compare お出で (​oide) of similarly broad and context-dependent meaning.

• お出 (い)でになる (oide ni naru)

• いらっしゃい (irasshai)
• いらっしゃいませ (irasshaimase)