| indicator(mark, sign, signpost, marker) | |
| indirect(adjective, circumstantial) | |
| inferential(adjective, circumstantial) | |
| information(noun, influence, inspiration, signal, key) | |
| innovatory(adjective, momentous, milestone) | |
| instant(noun, circumstance) | |
| instructions(noun, information, influence, inspiration, signal) | |
| interferometer | |
| issue | |
| kernel | |
| key(noun, information, influence, inspiration, signal) | |
| keystone | |
| lightship | |
| main point | |
| main thing | |
| manual(noun, information, influence, inspiration, signal) | |
| material point | |
| meat | |
| menhir | |
| moment(noun, circumstance) |
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| APA | Smart Define. (2015). landmark thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/landmark/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "landmark thesaurus" https://smartdefine.org/landmark/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, landmark thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/landmark/thesaurus/synonyms>. |
| MLA | Smart Define. "landmark thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/landmark/thesaurus/synonyms> |